Basic Relay diagram - IOW what goes where

A few people have asked what gets connected to the different connectors on a relay.
Well, since I had an idea, but wasnt 100% sure, I did some reading and decided to do a quick vid.
I hope it helps.
AH
p.s. double check to make sure
;)
P.S. for those that are wondering where I got the support info for this, check out these links...
www.offroaders.com/info/tech-c...
www3.telus.net/desktopsolution...
I'm sure there are more and that there is more than one way to skin a cat.

[@chriscockerham1976]

FINALLY! Someone made a video that can explain the wiring to a kindergartner like myself. this wire goes here, this wire goes there etc. thank you for this video! I now understand how the relay works​.

[@tutorials1460]

I think the 5 pin relay has a 87a,and its the same as the # 30

[@moeketsimoloi4963]

Thank you so much, after watching several videos on these I was able to wire the radiator cooling fan on my Ford Focus mk2,u helped saving my engine

[@29Gleisson]

Thanks for being, quick, clear and straight to the point!

[@emyf83]

Wow! That's great!

[@fuguf1sh]

Thanks! Using your video I was able to get the fog lights fixed on my motorcycle. Previous owner hooked up the red fused 12V wire going to “30” on the relay to the negative terminal of the battery!

[@menjivar76]

Excellent video, Quick, Simple and to the Point. 👏👏👏👏 Good Job 👍

[@tonyj8947]

Good video well explained. I don't know what HHO is but its the same as device/accessory. FYI: Lots of videos about wiring relay connections vary in two ways. Keep in mind that 80 & 37 could be reversed hook-up and 85 & 87 could be reversed hook-up too. IE: 87 could go to positive battery and 30 could go to the HHO cell/device....86 could go to ground and 85 to the switch.

[@ronhall3555]

I understand how a relay works now , thanks so much ,well done.

[@MisterGulsby]

YES! Exactly what I was talking about on the last vid. For some reason in your last install vid I thought you had hooked the switch up between the positve terminal on the battery and the #30 on the relay, which could kill the switch. Hey, I have found the "Add-a-Circuit" at my local Auto Parts to be GREAT! They plug right into your fuse box, and have a wire lead that you can wire to the switch then the #86. Simply plug the existing 10A fuse back into it, and WALLAH! Use ACCESSORY line & fuse

[@PPGAddict]

Thank you...concise and simplistic. Solved my issue

[@AndysDogHouse]

Great explanation, but I just bought relays from Amazon and the pin #'s are # 1 Blk, #2 Blu, # 3 Red, # 4 Wht. I don't know it the colors mean anything, or do I go by the numbers. Do you know how theses are wired up. I am lost. Thanks.

[@elisuamtz]

Well thanks for the video is really good I have cuestion do you have any idea how can fine a short circuit in my car? Thanks for you help

[@DAVENMEMPHIS]

i have seen videos where 30 goes to pos. wire to lights,, 87 to pos. of battery,, 85 ground,,86 switch. but i have my lights like in your video. and in some videos 87A turns something on when you turn off switch and another video 87 and 87A is for each light rather than both lights on 87.... i`m more confused from watching all these videos, could you explain in a easy way please.

[@tlkfromdaby]

Can you spice a ground triggerin between the switch and the pin number 86???? Im asking because i want to know if its possible to bypass the switch if i forget to turn it on with the system.

[@BigR27]

Great video... best yet ..easy to understand...

[@yulianajuega4280]

so if i put a switch do i have to connect it to the ignition . or can only have 1 terminal for relay

[@Marginal391]

Thank you. How do I trace the ignition wire? Regards.

[@ghulamfarooq3587]

Thanks man it's really helpful video for me.

[@ChumyMototo]

The fifth connector or terminal on a relay buddy (track 2:29), is the "Normally-Close" terminal of terminal-87, means while the switch on your diagram is OFF, then its connected or closed-in at that fifth terminal or the center terminal which is also called the 87-A, or simply "Normally-Close".

[@BigFireDave]

The relays with the 5th connector is like a single pole double pole switch. The other terminal is a normally closed position and when activated will shut off when the other one turns on. They are very handy if you want power sources to a load from two different power sources or if you want power applied to one load and switched to a second load when activated. OR if you want something on all the time and shut off when activated (usually safety circuits)the relay is just a mechanical switch

[@brucebranstad6770]

The 5-pin relay that you are referring to has both a Normally Open (N.O.) and Normally Closed (N.C.) contacts. These are know as N.O. (87) and N.C. (87a).

[@yessure5291]

Yes...

[@joemontano9769]

Who cell what's ice for is it agas

[@PIANOSTYLE100]

I am a semi retired electronic tech.. I have a few cars that I have to keep going. This is one of the few sites that give common sense explanation of the workings of this standard spdt relay.. if I understand this power 12 volts is on 30 which is useless until the relay is grounded by the computer.. I think that initially the fuel pump on Ford 150 circa 1999 is primed and controlled by this pin. is that true.. also would it be ok to post a in-depth troubleshooting I am working out on my 99 expy. I don't want to and refuse to just throw parts at a truck just because I was too lazy to understand a circuit.

[@TheBMiester]

Great video. I don't know why other people have 20 min videos to explain the same thing.

[@ZRace67]

Thanks a lot for the helpful info. Great video.

[@danielreyes9055]

hello! I have a relay Siemens 72HV603 and need to know how I make a test to this relay and to know how i can repair. thanks

[@josephlturbo9597]

Thanks, very informative!

[@bunnyz696]

I bought a wolo horn for my vehicle, i installed one on my jeep with no relay. but with the one i got i decided to have a switch for it which has a relay with it. now what sort of fuse can i use and where can i find it? thanks

[@ballesteros92]

what is an HHO? I have a train horn kit that came with a 12v compressor, 2 horns, nuts/bolts and the tubing that goes to compressor and horns and a relay.... it has the same relay thats in the vid... how do i install it in a 2002 hyundai elantra gls

[@fernandlemay8164]

Très bien illustré pour le même projet HHO ! Merci ! ;-)

[@DRSKINGDAVID]

my writeup for wiring parking lights show that the ground would be the 30 how does that work If you just said that the ground is the power source?

[@WilliamMurphy69]

87a is a constant on till 87 is made. Then it is off. I use it to run a switchback LED. 87a is for the white LED and then 87 is for the Amber/Red LED. In turn it alternates from white to color as needed.

[@Lapeerphoto]

Also I have run across some 5 Pin relays that had 2x "87" pins, that are not 87 and 87a. When I metered them they were both 87 terminals. I guess like for running headlights from the same electrical connection but different terminals. This is another case why its important to know how to use your VOM/DVM.

[@paulgabby3750]

You are correct sir. 2x87.... for your headlights.

[@anthonymcdaniel1862]

very simple and informative

[@DannyBoyPT]

excelente dude! This help me a lot.. Nice work. thanks :)

[@MrArtwho]

I installed a 5 connector relay. The purpose of the 5th connection in my case was to connect to a second (or twin horn). It was labelled 87 (2 87 connectors).

[@michaeljones2926]

so then does the other part of the switch go to ground?

[@johnnybraun77]

The fourth post (87) is "normally open" and the fifth post (87A) is "normally closed". Meaning that 87 will be "off" until you energize the coil (85 and 86 posts) and 87A will always be "on" until you energize the coil.

[@troubledtrouabdour]

I'm having problems finding a relay, everywhere I've gone they try to give me a fusible link. Do you know where I would be able to pick one up and how much?

[@MrKege1]

Steve, it'd be real helpful if you did a demonstration of the actual parts being or have the connected parts displayed on a table all laid out. I just bought a HHO kit and am kinda confused about the relay connection to the on/off switch - isn't there supposed to be a complete circuit instead of a 1 wire connection to the on/off switch?

[@GooseDave]

Great - good explanation and diagram

[@shanewilliams2021]

Easiest explanation ever.

[@percivallupato9574]

is thesame conection the 12v and 24v relay?

[@TheHomy70]

isn't the extra connector for low and high beams if you are working on headlights?

[@heatmizer1212]

i have 5 places that have the male tab type terminals...what does the center tab doo?

[@robertholsopple9451]

how would I jump a relay. to drain a fuel tank. which ones do I connect together then put the relay back in?

[@nando760522]

hi. i need some help... please... i,m working on a 1985 suzuki bike, trying to conect the cooling fan and get it to work with the temperature switch,, everything is brand new, i have try so many dif ways and is not working. the temperature switch has two pin.... please help....

[@aburani1]

what is the best way to test the main relay in diesel truck because the truck did not start cranking only

[@ronjr4268]

After i replace new relay and new coolent temperature swicth My car fans running when key in the on position. The fans No more autorun.... pls help.. i want my car fans auto run when the engine temperature reach it idle level.

[@georgebliss2819]

I have a comment in that I too run fused power to post 30 and post 87 goes to my device. What I do differently, is I run a jump wire from 30 to 86. So instead of having a hot wire at my dash and running to post 87 I run a ground wire from post 86 to a toggle switch at my dash where it's grounded on the other side of the toggle switch. This way if there's a short in the wire running from the relay to the dash the only thing that will happen is that the device will turn on through the relay. It also saves half the distance of wire needed to run from the relay and back to the relay.

[@johngraham6143]

Fixed my Ford focus, bad relay, you rock,Thanks.....................

[@TheEdster1981]

Damm that was easy! Thank you

[@akaphon007usa]

87A normally connected when no power and ground to the coil, for me I used 87a for auto cut off when engine stall , if the terminal 85 connected with oil pressure switch relay should open when energy to the coil and reconnect when engine running

[@husky1232]

Hello can 85&86 be connected to a 2 pin switch

[@MarceloFabiani1972]

maybe is off topic but I have a truck that uses 24v battery and a circuit to cut power that we send via a avl (automotive vehicle locator) , we succeded to make a circuit for a 12v battery car, what we wonder if we use a 24v relay 1.-does the circuit and wiring of cables has to be the same? 2.-the battery are 60 amps, and the relay that we want to use is 30 amps is this ok, sorry for my english

[@heatmizer1212]

if the guage of wire u use wont carry 30 amps,that 30 amp relay is gona melt wires for sure.secondly,wont the relay trip at 30,and never let the 60 amps flow anyway?

[@rickregina5769]

The fifth pin will stay hot , such as a headlight scenario . 87 switches on / off for high beams . The 5th pin 87a would power up after you shut your high beam off and is ran from a daytime running light

[@chavoya123]

the relay is 20, 30, or 40 amps? and the fuse is 20, 30 or 40 amos? the switch is necesary? i am making a hho generator for hidrogen to the truck, and this is very interesting, easy to follow....the conections... thanks chavoya123

[@johnmorell2663]

The 5th in the center /for a relay with 5 connectors is for will say 3 way switch / you could hook that up to your reverse light wire when you put vehicle in reverse will activate relay from that point. Without flipping other switch to activate whatever you have on that relay.

[@ELCHACHALAKO]

THANKS FOR THE ANSWER,,,just to make sure IM ON TRACK GUYS

[@alandxp]

excelllant explanation and good diagram

[@milkman16]

wow this really helped. I'm such a visual learner and boy did this help. Anyway you could explain the purpose of the relay? I know it converts a small circuit into a big one but i just don't really understand that I guess..

[@paisitalondono01]

Thank So much. From Colombia. Regards.!

[@alfa69er]

@ELCHACHALAKO The HHo he is referring to is a hydrogen producing cell. It is commonly used when people want to obtain better gas mileage in their vehicle. Nevermind the HHo part its basically just the main output for the relay.

[@milkman16]

very helpful man. I'm such a visual learner and this really helped big time. Thanks!!

[@mohdakirjokey7964]

Very good tutorial. Thank you Sir

[@gcfcos]

Great video!!

[@01jordanfirst]

could i use any relay to make a few LEDs flash?

[@MultiOutdoorman]

The 87a pin on these relays can, in simple terms, be connected to a load (lamp etc) that should be operational normally but is turned off when the switch is thrown to the ON position... as opposed to pin 87 which becomes energised when the switch is thrown on ! Like a 2-way switch in effect. My hydrogen cell is powered from my car ignition circuit for safety, which powers the engines oil pressure lamp...but the system only operates when my oil-pressure light goes OFF. (engine running and pressure ok) Now do you guys get it ?

[@CarlosMunoz-ln9fv]

Para mi es una excelente forma de aprender algo nuevo Gracias por la informacion

[@BloodyKnives66]

So if I want to add an electric fan to the diagram where would I add it? Also do I need a relay to do a toggle switch fan?

[@chevelle99xify]

yes, or the switch will get real hot.

[@edlee7917]

Hot power wife from fan connects with 87. Ground wire from fan goes to ground.

[@robertengroff5112]

so if i dont use a switch would the ignition act as the switch.. In other words if im using the relay for a fan then the fan will always run while the ignition is on?

[@stephenrichard487]

Yes

[@PBS-nm1uu]

thanks you made it simple to understand

[@joeykline5717]

hi, the diagram that is shown here is different from i found online, for example, wire pin 85 of relay to 12v supply wire pin 86 to good ground wire pin 30 to battery wire pin 87 to HHO Cell

[@ejioforndukwe5990]

that's ok, i need the full lectures.

[@artyfuffkin7805]

Power lead ? ,that's neg side right ?

[@domingodeanda233]

That was pretty damn good .

[@fadiamine2503]

I VE a 3 pin relay horn I want test it but Idon t know how THANKS for help

[@scottystiffchicken]

Short & Sweet.

[@razuuk004]

the 5th connector is 87A and here is how it works. when the relay in not magnetically energized, the 30 and 87A are connected. when the relay is energized, the 30 and 87 are connected. you can use it in multiple functions like powering up 2 different loads or sending positive to a wire when energized and ground when not,etc etc etc.

[@williamrando3631]

you have no power going to youre coil...86 & 87...what energizes coil?...also you wanted to know what the A post was for.. its to turn whatever youre turning on..off..if you wire it that way...

[@o0Orange]

so can you flip 85 and 86 from power to ground or the opposite

[@o0Orange]

i see other relays 85 is positive and 86 is ground, so as long there is circuit between 85 and 86 that should make and 30 and 87 in contact and deliver the power, right?!

[@shauntedds3882]

Can you help me I have a motor home with a electric fuel pump which is run be a 12 volt relay. The pump keeps cutting out when driving along. When you test the relay there is always power to it but nothing coming out. Wait for 1/2 hour and it work again. We have tried a new relay no good. Please Please help me.

[@danielmottweiler9809]

power flows from 30 to 87 in its normal state, when 86 and 85 energize the coil 30 then switches to 87a from 87. 87a is the 5th connector,in the center of the coil.

[@civicrocker]

To answer the question in the video, the fifth connector on a relay is just another output in parallel to 87 that would go to the HHO system. it is located in the center of all the other connectors. I am talking about aftermarket relays as each auto manufacture has there own design and pinout.

[@zmaness79]

The 5th contact is 87A. When there is no power on the switch circuit, the voltage from the battery is output through that pin. When you apply voltage across the switch circuit, the voltage from the battery is output through pin 87

[@louiscollin5773]

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[@bodenraylan5903]

@Louis Collin Instablaster :)

[@louiscollin5773]

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[@louiscollin5773]

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[@bodenraylan5903]

@Louis Collin Glad I could help =)

[@DormantIdeasNIQ]

5th connector: - 87a live by default ... a grounded LED on it would stay on all the time, unless the Relay is activated, then it would go off as 87 becomes the new current path in the high circuit. - or a second 87 that you can use to power up 2 items like 2 headlights High Beams

[@christalsystemcare9705]

Thanks dude...

[@rashpalsingh1298]

best teacher

[@choudharysahab4953]

Good information sir

[@AndysDogHouse]

pin 30 is powered from the battery. pin 86 is powered from a switch. How come two power sources??

[@hing983]

hi any kown how to wire relay to 12v battery bank if battery is full and then switch to grid tie inverter from solar pannel

[@nasimbaig6352]

Hi. someone knows what is the HHO? Thanks

[@melmatech]

there are Relays which have pin 87a and 87. 87a is the exit line when 85 & 86 is not active. means 30 runs through 87a. if 85 & 86 activate the Relay then 30 runs through 87. 87a is the exit line 1 87 is the exit line 2 exit line 1 is active when relay switch is powerless (85 & 86) have no flow. exit line 2 active when relay switch have power (85 & 86) have flow.

[@mikeyboy2154]

excellent summary

[@yulianajuega4280]

or do i ground the switch?

[@usmanhabib9458]

Which are connected to generator?

[@Ricardo-sx5xk]

the fifth gets power when all are off. so say as an ex when you shut lights off connected to relay the fifth would be a nightlight that comes on as soon as everything goes off. or an alarm after radio is off car is off alarm is energized

[@joeholderegger7534]

why can't I find a four pin relay . no one carries the 12 v 0 332 002 174.

[@Earthling_444]

What is the amp of fuse?

[@moonielo]

hey, do know a guy name Greg who does the superstorm cells? whatever happened to him, all his videos disappeared.. latest vid i saw him doing was something about making easy money online.. did he get booked or something? weird..

[@haniffjamil]

this question is actually apart from relay system..its about the hho system...i wanna ask that where does the negative terminal of the hho connected to?

[@titan2654]

very helpfull man thanks

[@omarymasoudykisondo389]

That's easy to know how relay function

[@kabandajamilu9036]

So nice