How To Wire a 4 or 5 Pin Relay With a Negative Trigger Wire.

In this video, I explain why it is necessary to use a relay in a circuit. I then demonstrate how to wire a 5 pin relay with a negative trigger wire. The benefits of using a negative trigger wire on a 5 pin relay would be - one less power wire going to the relay, and not needing a power wire feeding your switch. This may be beneficial depending on what type of accessories you are wiring into your car or truck. You could use this method for a radiator fan, fuel pump, headlights fog lights, spot lights, LED lights and probably hundreds of other uses.
How to wire a relay with a negative switch
00:00 Why use a relay instead of a switch?
1:00 Pin 30 + Pin 86 - Connect them both together to a fused 12V power source.
1:31 Pin 87 - Sends power out to your accessory.
1:59 Pin 85 - Connect to the switch, with the other side of the switch going to ground.
Pin 30 - Incoming 12v to the relay from the battery (fused)
Pin 86 - incoming 12v to the relay from the battery (fused) - Tied in with Pin 30
Pin 87 - Outgoing power from the relay to the electric accessory (lights, pump, fans, etc)
Pin 85 - Negative trigger wire to turn on the relay. Should be connected to a switch. The other side of the switch should connect to a ground.
Pin 87a - Empty
🔗 5 Pack of Relays: amzn.to/2FDvkne
🔗 10 Pack of Fuse Holders amzn.to/3k4vRgK
🔗 272 piece fuse variety pack amzn.to/3k48cNt
*As an Amazon associate I earn from qualifying purchases.
🔔 Subscribe to This KZbin Channel: www.rattymusclecar.com/Subscribe
🔔 Follow me on Instagram: @Ratty_Muscle_Car www.rattymusclecar.com/Instagram
🔔 Join me on Facebook: www.rattymusclecar.com/Facebook
Tags:
#RattyMuscleCar
#Automotivewiring
#WiringRescue
#FuelPumpRelay
Please Note: This video description contains affiliate links, which means that if you click on one of the product links above, I will receive a small commission. This helps support this channel and allows me to continue to make videos like this. Thank you kindly for your support!

[@WiringRescue]

Thank You for Watching the negative trigger 5 pin relay wiring video! Subscribe To This KZbin Channel: kzbin.info See My Wiring Playlist: kzbin.info/aero/PLsF7T1tRFy2hmiiUUfMZNyV-BUA_yrPIh

[@stevepointer8796]

Hi. Thank you for your videos. I used your 5 pin relay video to wire my fog lights. The 87a pin leaves my indicator light on like the video says, but how do I reverse it so the indicator light comes on with the fog lights? Any help would be greatly appreciated!

[@miomine3527]

Ratty muscle car.. I have a quick question should I use a relay for the switches on my power windows conversion kit or would it be fine without it... I'm trying to put power windows on my truck..

[@miomine3527]

The power window switch is a 5 pin switch...

[@chriskathichloesteven9458]

hi can the negative switch wire be a thin wire gauge say like 22awg?

[@kleinstruction874]

I love how you have all your wires attached to a piece of cardboard like a science fair demonstration lol. Very helpful!!!

[@WiringRescue]

Thanks! I’m glad it was helpful! It also reminds me of a story... I created a remote controlled house light switch for a science fair when I was a kid in the early 1990’s. I used RC car parts that could attach to any light switch. I lost the science fair to a classmate with model rocket engines strapped to a pair of skis. I’m still sour about it. I should have patented my light switch idea, but everyone thought it was stupid and I was only like 10 years old. “Why would anybody want to remotely control a light?!” Lol.... #hugeregrets

[@kleinstruction874]

@@WiringRescue Ha! You were ahead of your time!

[@WiringRescue]

@@kleinstruction874 - I certainly thought so! Rather that inventing technology that the world isn’t ready for, I’m sticking with the cardboard electrical diagrams for teaching others! Lol

[@kleinstruction874]

@@WiringRescue Yes, stick to what the average person can relate to- cardboard and zip ties!! Reminds me of a joke- The only tools you need are WD-40 and duct tape.... if something won't move, use WD-40. If something moves when it shouldn't, use duct tape...

[@WiringRescue]

@@kleinstruction874 - lol solid advice right there!!

[@Kloco78]

This seems like the only video that shows what to do with the 86 wire. Every other video I’ve watched I’ve watched many of them they skip this step. Thank you sir.

[@WiringRescue]

Happy to help!

[@b.s.adventures9421]

Used this type for circuit for electric fans on an old hot rod back in the 90s. Used a coolant temp thermo switch from some euro car as the ground switch, with a backup manual switch wired in as well. Worked great.

[@stanlee-nt2zv]

FANTASTIC!!!! this is very stright forward and easy to understand. I have a fan that has to be triggered with the negitive wire. Thank You!!!!!

[@WiringRescue]

If you liked this, you’ll probably enjoy my fan wiring video even more! kzbin.info/www/bejne/b3nNaIWfaLmLnsU

[@artramirez3506]

Simple. Clear. Concise. I like it. Subscribed.

[@WiringRescue]

Thank you! I genuinely appreciate it!

[@catherineharris4746]

Simply outstanding and simplified! Thank you!👍👍👍👍👍

[@WiringRescue]

That’s super nice! Thanks for watching my video and the kind words!

[@charlbarkhuizen7832]

This was the first actual helpful and explanatory video ive found

[@WiringRescue]

Excellent! Thank you for watching!

[@richleeman]

Thank you for making this video. Helped me out!

[@WiringRescue]

Awesome ! I’m happy to hear the video helped you out!

[@johnpauljones965]

Great video. Quick and to the point.

[@WiringRescue]

Thank you for watching!!

[@TheWaterman1000]

Thanks for posting this video. It refreshed my mind. Building a rc mower and would be using a remote switch to trigger this relay and that in turn will trip a high amp relay for the motor controller so I can cut power via the transmitter so if there's a problem the mower will shut down and not going on a rampage.

[@WiringRescue]

This sounds like an absolutely awesome project! It's probably best if the RC mowers don't rise up and take over. Having the kill switch on the transmitter is a necessity!

[@michaelscott181]

Excellent. Thank you!

[@sssrp80]

You do a very good job explaining things. Much props given, I can build cars but I can't make a good KZbin video. Lol. You should do one on how brake lights work and still let a blinker "blink"

[@WiringRescue]

I’m glad you like the video! I’ve actually got a whole bunch of wiring videos, including the one you mentioned! kzbin.info/www/bejne/f6DCmmxmZpuiZ5I thanks for watching!

[@radnaabaatardovchin8779]

Thanks, it was very helpful.

[@WiringRescue]

You’re welcome! I’m happy to hear it was helpful!

[@bigal878]

Great video

[@WiringRescue]

Thank you! You’re great too.

[@AntonioClaudioMichael]

Shared on social medias bro good work

[@dusint]

You helped me so much. Greetings from germany

[@WiringRescue]

That’s fantastic! Thanks for watching! I can’t believe my videos are being watched all around the world!

[@ChiSokchea]

Good video for sharing

[@Georgiaguntraining]

Excellent.

[@WiringRescue]

Thanks! I have a whole playlist of wiring videos if you’re interested! kzbin.info/aero/PLsF7T1tRFy2hmiiUUfMZNyV-BUA_yrPIh

[@grilledchickenwrap]

Great video.. you just made me understand relay LOL

[@WiringRescue]

Thats fantastic! I'm happy it is helping people out.

[@mikemoore2692]

Love the video. Pain trying to find a 75 amp negative trigger relay with mounting eyelet

[@alanh2920]

Thank you for the great info! I am looking to build a fused relay to control several accessories through the use of those 5 pin rocker switches (probably 4-6). I like the idea of negative triggering because, as i understand it, it means there is only power going through the switch when it is on. That said, i am having a hard time figuring out how you would wire the switches themselves. Any help you could provide would be greatly welcomed. Thanks again for the great content.

[@MindDezign]

This is very useful Datsun 240Z have a negative trigger head light and turn signal switch, this is very useful. I have found every wiring tutorial you have done very useful so thank you. It's very very very possible to over think wired circuits . This series has broken down all the systems to useful Chunk's system by system. Can you show how to wire a viper alarm to a Classic car since they don't come with instructions in english

[@WiringRescue]

Thanks for the kind words! I’m unfortunately unable to do a viper alarm system video. I generally dislike wiring alarms because they cause more problems to car wiring than I prefer. Also - thieves are good at getting around alarm systems. You may be better off with cameras facing the car and a mean dog.

[@K03sport]

...just put a live viper 🐍 in the car and problem solved; no wiring needed. You can still use the sticker "Protected by Viper"...it's just that the real surprise is on the inside. I've often thought of wiring a Rattlesnake rattle to a motion activated switch in the car. Can you imagine opening a cat door and hearing the rattle but not seeing the snake....

[@rajbahadur2162]

Good video sar

[@chickenmcfly2133]

Thanks!

[@WiringRescue]

You’re very welcome!

[@macheetemacheete3153]

Very good explanation. I wonder if need fuse between relay and switch. Thanks

[@laurensiemens1436]

Hi great video ......can you use 87a to have a light inside the cab to let you know the electric fan is on?

[@modestaskavaliauskis7985]

Hi. I have subaru forester sg, and orginal light is h4, one light is on L/H beam, and I heard when feeds over minus, or I can use this electrical circuit to connect the led bar?

[@grilledchickenwrap]

got a question for you... on the on and off switch where you placed your negative trigger wire are they both connected on the silver tabs ? because if I place one in the ground ... it will not work. mines only work when I have both on the positive or silver tabs... thanks.

[@GT6Time]

Hello sir, thanks a lot for this! Question; I'm changing the heater in my 1971 Triumph to an all electric one. Originally it had a switched ground, but no relais or fuse. I want to incorporate them to be safe, but use the standard power wire from the old heater. This is a switched 12v, would that be OK? I do not need to use the heater without the car running anyway as it will just drain the battery

[@jabbagna4237]

Maybe u can help I have 8 lights in series with a plunger switches on each cargo door to turn the lights on and off when the doors open. This is on a motor home. I recently discovered all the lights are staying on constantly when all the doors are closed. I removed the ground wire on the first door switch and all the lights went out. Is this a possible relay issue has me a bit stumped. I am not sure if it is a 5 pin or 4 pin relay it is difficult to reach and have have to tried yet. Thank you for the great educational videos.

[@danielmcnamee308]

I’m looking to wire a livewell timer in my boat. Single switch with on position off and timer position. I believe this has answered my question but not sure if I would use pin 87a for the on switch position??

[@TheRealDrGreenbaum]

This is great. Thank you. It seems that we can cut down wires running through the firewall to one, that is the wiring to the switch and then subsequently to ground on the same side as the switch. Is this correct?

[@darrentrutzenbach637]

Great video thanks for making it. One question on this 5 pin negative switch relay. Can i use another accessory on pin 87a and it will switch between the two? I am trying to figure out how to best install a switch on my third brake light so that i can bypass the installed flasher module just incase i need to disable it and revert back to normal third brake light operation. The negative ground switch seems like i lot less work if i want to put that switch somewhere on my dashboard. Cheers.

[@WiringRescue]

That sounds like it will work, as long as you are okay with one of them being active at all times. There would be no way to turn them both off, but it sounds like you don’t need that. So I’d say you’re good to go!

[@jcom834]

Great vids, they've helped in building my fuse and relay panel. There's still something I'm not understanding or I'm not sure if it can be done. I want to use a 5 pin momentary switch ,which I believe has led, to have switched ground for a 5 pin relay. Is it possible to use a 5 pin switch for ground and still have the led turn on?? Led will be on only when vehicle lights are turned on. Thankyou!!

[@auto-funatics7147]

Also trying to figure this one out. I see that he is using a led switch but does not have the GROUND pin connected - usually used for the led. I wonder if this is the disadvantage... But I'm sure there's a way?

[@beardedlocoswoodworks]

How would you connect a 5 prong momentary button to this set up. Great video by the way 👍🏽 I learned a lot thanks

[@TheBnorman93]

Is there a way to do this with a latching style switch spdt and keep the led on the button on as well I’m using a door jamb negative in order to wire it to the switch as a trigger and on one side ground to engage the dome light but I can’t for the life of me figure out how to keep the light on, on the button and have it turn off when I lock the vehicle it’s a 2007 Tacoma. Thanks for any help in advance! The switch is a apiele 16 mm

[@bamsr9051]

The switch on off button. The negative cable you connect with what pin? In or out source?

[@beeasy4360]

U might be the man to answer my question how many relays can u put on one key on hot can u have that one trigger control multiple relays to turn on are no ?

[@binusr4214]

Thanks grate

[@WiringRescue]

Thanks for watching!

[@yolandodeguzman4706]

Thank you for this video. It's got the most info I need so far and the clearest and most precise explanations yet. I need help with a replacement 5 wire (+,--, park, high-and low-speeds) Nissan wiper motor that seems to work only when high and low are fed from the ground. I've heard others say that this is the difference with Nissan from other wiper motors (high and low are positive), Is this true and can I use a negative trigger relay for this? i'd be grateful for any help.

[@WiringRescue]

Sadly I am totally unfamiliar with that wiper setup so I don’t think I could be of much help.

[@billyrobles8457]

Hi I connected my rock lights to dome lights using a relay. Battery 12 v to pin 30, dome light from car to pin 86 , 85 to ground and 87 to dome lights. It turns on well but when the lights are dimming, the relay starts to buzz. Should I do a negative trigger similar to this video? Or is there something I can do to stop the buzzing?

[@jackbalitok3910]

Now I get it. A relay is like a strong guy helping a kid (the manual switch) carry out heavy load.

[@WiringRescue]

Yes, exactly! I love that! Thank you for watching the video, I very much appreciate it!

[@catherineharris4746]

Damn great way of putting it😂👍👍👍

[@76ShadowGhost]

exactly. The switch only has to energize a small coil inside the relay (usually a few milliamps). Once the contacts of the relay are made it can pass whatever current the relay is rated for (usually 15 amps for the one in the video). I have seen a micro switch activate a 100 horsepower electric motor by using a relay and a contactor.

[@roselh1]

I love your videos and have enjoyed being a subscriber to your channel. I have also watched your fan wiring video and I have a question for you. I have a ground activated radiator fan through a relay. No thermostat, just a switch. My toggle switch has three terminals and it has a warning light in the toggle that I want to use. I think I have the fan wired properly and everything seems to work as it should. I have my 85 ground wire going to the center terminal on the three terminal switch and I have a ground wire on one of the side terminals. Unfortunately, when I switch the toggle and turn on the fan, the warning light on the toggle does not light and I cannot figure out how to get it to do so. I noticed in this video it appears that you are also using a switch that lights when the unit is switched on, but unless I am mistaken, your switch light is also not working when the fan is on. Can you tell me how we can solve this problem? Thanks so much! Lin

[@kolesplace]

Thank you, exactly what I was looking for. Should the fuse be above or below the rated amp for the source? I'm installing a USB charger that is 6.4 amps. Is a 10amp fuse okay or should I go to 7.5 or even lower?

[@WiringRescue]

I actually made a video for this question because it comes up so often! :) Here you go: kzbin.info/www/bejne/e5ndf2mLmdOghqM

[@williamsnider6307]

Thanks, I was able to do this and have two different power sources controlling my acc.switches.

[@WiringRescue]

Excellent! I'm thrilled that you found the video helpful! Thanks for watching!

[@williamsnider6307]

@@WiringRescue yur welcome

[@leontownsend8790]

I have done this using using a negative trigger on high beam, however the LED in the switch works in reverse when you connect the switches ground wire to ground. In fact, when the switch is on the LED is constantly illuminated and when high beam switch is switched on the LED goes out. In your example, your not showing the LED working, how can I get the LED to work correctly on negative switching?

[@auto-funatics7147]

Same problem here...

[@Rubie_the_Black_Widow_Subie]

Do you have a video with a 5 pole relay connected to a 3+ pole switch?

[@casemods]

Can this method work if the ground wire is 12v+ when idle but turns to ground when engaged?

[@IWario1]

Which wire is the one we use to connect to the ACC? So my fog lights turn off automatically when I shut my car down

[@christinahollingsworth5335]

So I plan to use this on my e-bike instead of a power control module. The motor is 24 volt 250 w and the rated current on the motor is 13 amps..... So a 30 amp relay is plenty adequate, right?

[@koalagangsta8599]

It's still okay if you put the switch at + wire right?.. And should I add one more wire ground to battery if I want to connect the 87a pin to another components?

[@WiringRescue]

Yes, you can do that - check out this video and I show you exactly how: kzbin.info/www/bejne/jWOwo2WQnNtkec0

[@user-sc8jb4lj2w]

I have Honda Civic 2015, I am installing a right side camera and want to have the camera activate when using the right turn signal. I am using use the wire from the light switch that is for the right turn signal. I identified the wire, but it has 12 volts when the turn signal if off and drops to 0 volt when is on, how can I use a negative to positive output using a relay? By the way, thanks for the great video!

[@isaaccarty7073]

I only have one port coming out of an upfitter switch that I’d like to wire up to control ground. Can I combine the ground coming in and the ground going out?

[@Pisquini]

Hello great video! I do have one question. Do all 4 post relays have be used on a negative switch? Or can you use it for either? Positive switch or negative switch? If not, how do you determine which relay you have? neg or pos. switch. Thank you

[@WiringRescue]

Hello! 4 post relays can be used with a negative OR a positive switch. You can swap 85 and 86 from positive to negative with no issues. :)

[@Pisquini]

@@WiringRescue Thank you!

[@princehanz9792]

That switch have led indicator on it? Can u make it work too in that exact wiring?

[@calvin2516]

If the negative trigger wire is a signal from a ECU, am I safe? Trying to add brake lights to my bike, but the tail light has 3 leads. +/-/trigger ground. the + and - are for the lamp but it gets a ground signal to kick on the brake light from the ECU I believe.

[@myfaaammilly1607]

Is there power going through the 85 wire in this setup?

[@thelazylizardmatt]

Can you ground back to the battery?

[@Wardy75]

Is a different relay used for a negative trigger system or is it down to the wiring? Am I correct in my thinking that the switch is turning off the earth to relay, thus completing the circuit?

[@WiringRescue]

You are completely correct. It’s the same relay, just controlling the ground side of the circuit instead of the power side.

[@khancross]

I have a remote control lock module and want to connect the trunk opener. The cable from the module sends negative 300mA. My relay says 30A/40A. Can it be that -300mA is not enough to trigger such relay? Do I need a smaler amp relay?

[@dustinhigginbottom1211]

Can you use that switch to ground 2 relays?

[@davidcoleman2031]

Do you have any thing talking about 40/30 relays

[@rickm4295]

Can you use an OEM style switch when you wire this way? So that the switch lights up like all the other dash lights?

[@WiringRescue]

Absolutely! You just need to figure out how the OEM switch works. Sometimes they work in weird ways. But generally speaking - yes! Try it out!

[@sharewithraj]

I need to make a car clutch that disconnects (a 12v ground circuit) when the pedal is pressed can it be done with a relay? Pls help..

[@willycortez3732]

Can you make a tutorial video on how to connect the key switch with LED voltage display to show the real battery capacity of electric scooter like 36-42volts and should be connected to dashboard that requiring 5v supply. I saw some xiaomi scooter installing a key switch with voltage meter but most of them connected only from the out put supply from controller to a dashboad which is 5v only. How to rewire the 3 cables( 4 wire modification) from key switch to separate the voltage from the battery and to retain a 5v supply to a dashboard?

[@NikkoCruz]

How would this work if you have an LED light that has 3 wires coming out of it? It’s 90watts & runs on 24v

[@jasonbacklund9641]

How do u wire that 3rd pin on your switch to light up the switch??

[@DanyoPJr42o]

What if u have a 20 amp switch and my fan im running is 15 amps can i just run switch without relay since switch is a 20 amp switch?

[@josemeza7698]

Can I put. 30 and 86 to the same breaker or fuse ?

[@JahJah021]

Does the BLACK wire from relay go to POS on switch; and GROUND on switch go to GROUND source?

[@AndyTheXTech]

Great explanation! 👍

[@WiringRescue]

Thanks Andy!!

[@gibbydiy4235]

Hello, thanks for the videos.. I have a 24volt elec toy ride on jeep for a child.. I'm burning up the foot pedal I have tried different pedals but no luck. Can you do a video on wiring up a toy truck.. mine has a motor on each back wheel, lights two 12 volt batteries forward reverse lever 2 speed high and low. I'm thinking I need relays because I'm burning up the foot pedal.. thank u and bless u.

[@Luui2x]

can i connect my gronds to a chassis ground?

[@joelmolate8690]

Got a question. Are there any advantages for using negative trigger vs a positive trigger? Which of them is safer? Currently i am using a negative trigger for my fuel pump and starter.

[@WiringRescue]

They are both perfectly safe if wired right with appropriate fuses and wire sizes. They each have benefits. It really depends what you’re doing with them. Some people like negative triggers because it allows them to only run a negative wire into the car and ground it right to a dash. Others want a positive trigger because it’s necessary for controlling that type of circuit they have. Like everything in life “it depends”.

[@joelmolate8690]

@@WiringRescue Thank you for the reply. For me, i feel much safer running a negative wire through the firewall. And if there is already an existing circuit and just to add a relay i use the positive trigger. Thank you for your feedback. Makes me subscribed.

[@fishing_with_chaz]

So if you have a negative triggered switch and you don't have your switch run to a body ground if you hook up the negative wire will that trigger the fan accessory to come on? I have mine wired so it had a 3 pin switch with a negative pin that I have grounded to the battery and one power wire run to the battery and the other leg going to my accessory my negative wire when I touch it to the battery triggers the relay to open and I connect the ground wire to the other fan it turns the fan on even tho the switch is off any idea what I should check?

[@fishing_with_chaz]

I'm wiring 2 fans together one has a relay built in line with it the other just has the power running thru the switch and has a 15 amp fuse on the power wire

[@maldridge7630]

Appreciate the example you have created. It would've been ever more helpful if the colors of the wires were also written next to the pin numbers on the board. 👍

[@Luui2x]

Can I use 18g for grounds ?

[@jeffrygabriel1800]

Whats the difference between negative and positive rrigger relay... which do you prefer always

[@WiringRescue]

It really depends what the relay is being used for. I’ll give you two examples: 1. Let’s say you want some new fog lights to always come on with your headlights. You would use a power wire from your headlights to trigger the fog light relay (“positive trigger” on pin 86), which would flick your fog lights on whenever the headlights are powered up. 2. Now let’s instead pretend you want a toggle switch inside the cab of your truck to turn the new fog lights on. Using a negative trigger relay, you could keep all the power wires and relay under your hood. Then simply run one negative trigger wire (“negative trigger” from pin 86) inside the cab of your truck, to a switch. The other side of the switch could ground to any metal under your dashboard. By doing this, you won’t need to splice into any wires inside your truck, and there is no risk of the trigger wire rubbing on anything and popping a fuse, because the trigger is on the ground circuit. So in short “it depends”. :) hope that helped a bit.

[@jeffrygabriel1800]

@@WiringRescue switch here was commected to 85... 86 and 30 were connected to positive... very helpful... about to understand well... thanks

[@MechanicForGMCCars]

I was wondering culd relays be activated via pick up coil? I have loot different relays so Im surching to eliminate ignition trigger from me pick up coil. I noticed 4 diferent relays. 2pin warning light buzzer relay. 3 pin blinker relay 4pin rear windscrean heater relay 6 pin windscrean viper motor relay . So can I use any of those relays and make them programabel variabel for ignition coils?? At some acesions me car refused to stop when all 4 blinker worked engin worked in union with blinker relay,the second thing hapened me car self excelerated from idel to mac rpm be him self if I turned head lights ON. So I wonderd what the hell was all that about? I do have how ever linear voltage regulator inside me dashboard. Later I found the problem corroded wire was on back side lights didnt get ground andto me ignition key 1 black wire smoked hade bade conection. So any one know why that acured and how actualy control those relays manualy for engine speed? Its similar to buzz coil just in me case its fiering true the ground some how. Any usefull advice wuld be great. I wuld like to have that set up buzz coil with out ignition module for stationary engines generators who spin al very low rpm .

[@laurynassavarauskas5466]

I tried in a bit different way but it doesnt work for me.. can you help me? I negative(ground) to 86 pin and also connected my lamp wire to 86 then, 87 was connected to possitive of my lamp, 30 was connected to possitive battery and possitive switch and 85 was connected to negative switch.. and it doesnt work only the relay was buzzing

[@WiringRescue]

It sounds like you have a negative on Pin 85 and 86, which will make the relay not work. If you copy the directions in the video, you should have no trouble. I also have another method here: kzbin.info/www/bejne/jWOwo2WQnNtkec0

[@AccessTerminated]

I set up a negative triggered relay on my switch, but my issue is that the on position of the switch is an open circuit and the off position of the switch is a closed circuit. Therefore I am using 87a to power the lights. When the switch is off ( closed circuit) the relay is using power and will draw the battery down. Is there a way to hook this setup without the draw?

[@WiringRescue]

The easiest solution would be to use a different switch. However, I’m guessing that you like the switch you have. So - maybe use two relays: 1: set relay #1 up exactly how you have it right now. 2: set up a second relay that turns on with the ignition switch, and powers up pin 30 on relay #1. It’s not great, but it would probably work.

[@jasonrosas1295]

My question is for the three prong switch , mine has a internal light in the switch now by negatively triggering the set up does the internal light in the switch engage when turned on ?

[@WiringRescue]

Sadly if you use a negative trigger wire to the switch the light in the switch won’t work. :(

[@MCRinOC]

Great video! If using a switch with an internal bulb, can that cause damage to the relay…the bulb drawing amperage from the relay ground when switched on?

[@jasonvasquez1445]

Is it safe to splice into a wire that gives constant current? Just to supply power instead of wiring directly to the battery

[@WiringRescue]

It really depends, check out this video. It may help you make the decision: kzbin.info/www/bejne/e5ndf2mLmdOghqM

[@kolesplace]

When I'm installing a new component (light bar) on my truck I have the option of Positive or Negative trigger. What is the deciding factor on which option to choose?

[@WiringRescue]

Either will work if wired correctly. It mostly depends where you will be mounting the relay. Sometimes people don’t want to have a positive trigger wire running into their vehicle, because it could rub on something and short out. A negative wire will just turn your light on if the wire shorts out. Negative triggers also generally have less wiring because one side of the switch goes right to ground, which could be right next to the switch. Positive trigger needs a full power wire on each side of the switch.

[@kolesplace]

@@WiringRescue Excellent, you confirmed all I could muster up about the 2 circuits. Thank you.

[@wingzero989]

Im trying to wire up my fuel pump and my ecu im using has a negative ground for trigger. Does it matter if 85 or 86 gets the trigger if I follow your wiring example?

[@WiringRescue]

It is generally accepted that 85 is the ground, but it will likely work fine if you swap 85&86.

[@michaelfabellar5371]

Can i connect the 87a to the accesories with positive supply?

[@WiringRescue]

Depends what your goal is, because when the relay turns on, 87a goes dead. So 87 or 87A gets power depending on whether the relay is on or off. But they never have power at the same time.

[@jamalbrowne4809]

Hey Jeremy, Does the switch have a built in light that illuminates?

[@WiringRescue]

In this specific circuit, it does not.

[@jamalbrowne4809]

@@WiringRescuethanks for the reply. I’m about to wire up a switch panel similar to the one you used in race car switch panel video. Only difference is all of my switches look exactly like the master switch in your video and also I’m running a negative trigger wire.

[@orbelgalvarado]

So the ground is connected to the Trigger + positive and - negative to ground?

[@WiringRescue]

No. Pin 85 is a ground. So the wire come from pin 85 at the relay, to a switch. The other side of the switch goes to a ground. All the switch is doing is making and breaking the ground contact for the relay.

[@thehobotographer6860]

Is there a difference between a negative trigger relay and a positive trigger relay

[@WiringRescue]

Yes - I made a video all about it. Check this out. kzbin.info/www/bejne/h3TOl3l5gcaSgMksi=N0po2wpVu0TTfjBu

[@humbertogutierrez8404]

Dos It apply to a/c wiring as well?

[@WiringRescue]

I’m not sure. Probably depends on the vehicle.

[@Teryxfun.]

How bout if you want to factor in the ignition or acc to the relay so that nothing comes on until the ignition is on?

[@vkdrifts792]

the wires to the 30 and 86 would go to a key hot source instead of straight to the battery.

[@jerrybigrig9475]

Ok..I've got a 1992 Harley Davidson sportster..I've taken off the stock front forks and installed a 6 inch longer springer front end ..now for my situation..I'm using a rectangle car headlight ..didn't think of it initially but the headlight is drawing too much amps for this system..how would I wire in a duel headlight relay system..small rocker switches on system..don't want to melt harness,alternator/charging system..

[@WiringRescue]

Here is how I would do it: - buy a 4 or 5 pin relay (doesn’t matter which) - connect the factory Harley 12v+ headlight wire to pin 86 on the relay. - connect pin 85 to a ground - connect pin 30 to the battery with a fuse in between (fuse size would be based on how many amps the headlight draws) - connect pin 87 as the power feed to your new headlight. Then when you turn on your headlights, your factory Harley wiring will tell your relay to turn on, which will pop on your fancy new light! Good luck! Hope it works out!

[@jerrybigrig9475]

@@WiringRescue Thanks .. So a second relay then for high beam circuit..?? Is there a duel relay made ..or just use 2 relays ..

[@WiringRescue]

Check out this one I made. kzbin.info/www/bejne/ZpnCi5V_d62AY68. I think you could use 1 bulb, that has two filaments, and your factory low/high beam switch with a little creativity.

[@fall3n245]

Will this help my lightbar (led switch) from draining my battery?

[@WiringRescue]

If your light bar is draining your battery, it is definitely not wired right or not working right. I'd following this design in the video and see if it solves the problem.

[@76ShadowGhost]

If your light bar is running through a switch it most definitely could be because of the switch. Putting a relay in between would separate the source voltage to the light bar. If it still drains the battery it could be because a positive wire from the light bar is chaffed and creating a minor short to ground.

[@victorgama7804]

Mean I put the ground onto the negative in the battery?

[@WiringRescue]

The ground can go to the chassis of the vehicle if the chassis is grounded. Otherwise, the negative on the battery would be the best option.

[@luisramos1219]

How ca. I do this to a door lock switch

[@halifaxcanada3655]

If my accessories that I’m plugging in to has a 14gauge gauge power wire would i use a 14gauge wire to run from the relay Or could I use a smaller size wire from the relay to connect it ? That would be the yellow wire

[@WiringRescue]

As usual, "It depends". Your accessory that you are powering is what determines the wire size that is needed. Check out this video kzbin.info/www/bejne/e5ndf2mLmdOghqM I explain wire and fuse sizes in detail there.

[@halifaxcanada3655]

@@WiringRescue I’m wiring up aftermarket power windows they have their own switch to go up and down I just need to add a switch to to shut off the power to the relay when the car is parked. Can I use the same set up as you have here

[@76ShadowGhost]

If the accessories you are supplying power to is

[@rickm4295]

Is the negative wire coming out of the relay supposed to be 12.7v ? Mine is.......I think ive done something wrong

[@Luui2x]

I’ve been melting my switches not my fuse or relay so it weird I’m not running a fuse on switch tho but I am from battery to relay there is a fuse in btw..should I run both of does together?

[@WiringRescue]

Every circuit in a car should have a fuse protecting it someplace in my opinion. The large wire to the starter would be the only exception. If you are burning switches, you have more amperage flowing through the switch than your switch is rated for. So I would guess that whatever you are powering is being powered through the switch and not the relay. Could be a simple mix up with the wires. Double check that your switch is going to the proper pin on the relay. If you have the same relays as me, your switch should connect to either pin 85 or pin 86, depending on what you are trying to accomplish.

[@Luui2x]

@@WiringRescue I’m trying to manually turn on and off can I run a fuse from battery’ to pin 30 & and from battery againg with a fuse to the switch (main load) & Pin 86 goes to the switch to on ACC prong and 3rd prong goes to the ground with the relay pin 85 on the chassis …both 20 fuses in each holder for the 30 pin and one of the battery prongs

[@Luui2x]

@@WiringRescue or should I run the switch ground apart from the relay ground ? And radiator fans ? Or can I run them all into the chassis ?

[@Luui2x]

@@WiringRescue I have mine on pin 85 with a switch cuz I wanna manually turn it on and off …can I use 1guage wire for everytning and my fuse holder 12guage ?

[@rakishtennessean]

What if my switch is normally a 5v signal that gets interrupted by a brake lever