EASY CARBURETED LS ALTERNATOR WIRING FOR YOUR LS SWAP | LS Stand Alone Alternator Wiring | Carb LS |

[@NightWrencher]

Dont forget to enter to win a free holley carb! kzbin.info/www/bejne/l2a6hWZol9KZd9E

[@kingeyes8938]

Is the alternator supposed to be getting power while the car is off

[@NightWrencher]

@@kingeyes8938 the alternator is always recieving power through the big wire since it is connected to the battery directly. The small wire on the plug should only have power with the key on

[@joseluna2467]

@@NightWrencher hey so I am just curious, because I did this and as soon as I turn on headlights or radiator fans I get this god awful squealing coming from my alternator, but my belt and alternator are both brand new, any ideas?

[@MrMechanicandy]

Okay I’ll try the one wire first and see if it defaults to 13.8 , I saw a video that I can solder in four wire regulator but I try the one lug hook up first thanks

[@NightWrencher]

Good luck man!

[@joshuathomaswright]

It does not drop the ignition voltage, it drops the amperage. When it sees no resistance, it runs on a limp mode, until the voltage regulator can't take anymore, and then the regulator is fried. With the 470 ohm resistor, you are copying a signal that is about 95% of it maximum output. We run 500 ohm, and get 14.6 volts all day at the track. Great video BTW.

[@MIUBHI007]

So I’ve got an issue with mine. When I talked to Holley, they recommended a 560ohm resistor (as that’s what the wiring plug they sell has) so I ordered a 560. Installed it and it’s running 15.0-15.5 volts and if I’m understands correctly, I need to have about a 600ohm resistor in there to lower the voltage, correct? Or should I order a 470 and see what happens. If I had a store local I would just get both but I have to order them.

[@NightWrencher]

Ive done this 5 times and every time it was with a 470 ohm resistor, zero issues. I'm 100% sure that the higher the resistor, the more voltage the alternator will put out.

[@MIUBHI007]

@@NightWrencher Gotcha, thank you for the clarification and the quick response!

[@NightWrencher]

No problem, any time!

[@Keeterbob]

The wiring diagram for for 74 GMC trucks shows a 1.35 ohm resistor on the wire connected the alternator. Will this work? Or do I need a new wire with the ohm resistor you suggest?

[@NightWrencher]

Youre going to want to run a new wire with the correct resistor or youll risk burning it up. The old resistors were used to prevent back feeding when shutting off the engine

[@MrMechanicandy]

But I have the two wire dr44 alternator 2005 4.3 engine and running a carb how it where is the link for that alternator wire up I don’t think running it at 60% now and maybe after ac added I could bump it up to 80% thanks

[@NightWrencher]

I just saw this message, I think the 2 wire is PWM and cant be wired up like the 4 wire DR44. The good news is that I think you dont have to wire the 2 wires and just need to wire the big lug to the batter. Should default to 13.8volts

[@r.t.1942]

I m doing an LS swap on an obs , do I need a resister on the brown wire as well , or does the ecm take care of that , I have a standalone harness and the alternator has 2 wires brown and red

[@NightWrencher]

This is specifically for a carbureted LS using a Smart Spark LS or MSD 6014. If you're doing an efi swap you can do the resistor mod, but the stock ECM should take care of it.

[@richardbutterworth7873]

Are you using a 2 or 4 wire alternator?

[@NightWrencher]

The alternator uses a 4 wire plug. If it has a 2 wire plug, its a PWM alternator and I don't think it'll work with this mod.

[@dansclassicsandcustoms]

So just to clarify, I need 470 ohm resistor in addition to the resistance of the 194 dummy light bulb? Or 470 ohm total in the circuit?

[@NightWrencher]

One or the other. I wouldnt do the dummy light because if the light goes out, itll stop charging

[@irvingbar4569]

So all I have to do is hook up the alternator wire with 470ohm resistor to a 12 volt source what happens if you lose 12 volts when you hit the key on but than goes back to 12v when you let go of the ignition would this connection work thanks

[@irvingbar4569]

I really appreciate the help about to finally fire up the ls thanks once again

[@NightWrencher]

You should be ok. You dont need the alternator while cranking anyway so that would work fine.

[@mtrcyclmhm]

Can you run your cable directly to sarter from alt? And do the alt wire and starter wire connect to the same terminal on starter?

[@NightWrencher]

Yes you can tie the big lug on the alternator directly to the big lug on the starter, but you wont want to run the fat wire from the battery, to the alternator and then to the starter because if the wire over heats, itll damage your alternator so you want to go directly alternator to starter and starter to battery. The thin wire on the starter is for the ign switch and the thin wire on the alternator is for the ignition switch with an inline resistor

[@mtrcyclmhm]

@@NightWrencher yeah i had from lug on alternator to +battery then to starter, somthing shorted out yesterday and now i have no power at all to car, but no fuses have blown lol wish i would have seen this video first.

[@NightWrencher]

Oh man, time to break out the timing light and start poking wires!

[@scoop0213]

Question, can I just run it from a 12v acc with the resistor?

[@NightWrencher]

If the acc turns off with the key off then you should be fine. If it stays on when you turn the key off then itll keep running.

[@youngnation901]

What’s the voltage on the L terminal voltage after splicing it in … mine still is saying 12 v

[@Dhdub683]

I’m so confused I have one with two pigtail I have the cs-130D I don’t know how to runny do I run the brown wire back into the alternator then the pink and black wire with the resistor to the ignition switch

[@NightWrencher]

You are confusing this alternator with the one with the one for the older small block chevy. This one is the factory alternator used in the LS engines. Yours is a 2 wire set up with one wire going to the ignition switch and the other back into the back of the alternator just like you said

[@beeasy4360]

I wired mine like this but when key is turned car not running the alternator was humming is this normal it’s going in a 72 chevelle

[@NightWrencher]

Yes, thats pretty normal. Mine does the same thing.

[@beeasy4360]

@@NightWrencher thanks for the reply another question my car won’t turn off …. my msd 6014 is hooked straight to battery will that cause this issue of not turning off when key is off I try pulling off the 12 volts to alternator but keep running until I unhooked battery thanks for your help

[@NightWrencher]

Yes, as long as the engine is spinning, it will keep pulling fuel from the carb and as long as there is power to the MSD, the coils will continue to fire. Wiring the MSD to the ign switch directly or from a relay are going to be your options

[@beeasy4360]

@@NightWrencher I wired it to a relay and still same problem so I put a 30amp fuse inline with msd and hooked it to a on off switch solved that issues flip switch car Turns off not how I would of liked it but works lol thanks man what is your timing range set at from idle to 6000 rpm and did u disable map timing feature I was gonna set my timing so it shuts off if it runs hot

[@Keeterbob]

A wiring diagram would be great

[@NightWrencher]

I got a diagram on my instagram now

[@jrsfunreview8609]

I have a 78 c10 with a ls1 and a 69 c10 with a 350.. could I use those 470 ohms on with the sbc..

[@NightWrencher]

The 470 ohm resistor is specifically for the LS alternator. When using a 3 wire SBC alternator you have to do something similar except you have to run a wire to the battery light bulb and then from there to the alternator. The other wire goes back to get a feed signal like at the battery, and the big wire can go to the battery as well.

[@jrsfunreview8609]

@@NightWrencher battery light bulb or what other source could it be plugged in. I check for the battery light bulb and didn’t see it.

[@NightWrencher]

Some cars didnt have a battery bulb until later years and they used an external regulator to power the alternator but the 3 wire alt is internally regulated so you can pick up a light bulb socket and bulb, run the wires to to it like I mentioned before and install the socket somewhere you can see it. If the bulb goes out, the alternator will stop charging

[@jrsfunreview8609]

@@NightWrencher just came back from autozone and picked up the socket bulb which they only had a two wire socket bulb not a single wire. From the connected of the alternator I ran wire #1 to the socket light bulb and wire #2 from alternator right below to the bolt that has a 10gauge wire to the battery. Does that seem right. Just confused as to what to do now with the extra wire from the socket light bulb. Part #85802

[@NightWrencher]

The other wire from the socket goes to the ignition switch. So your ignition switch sends power to the bulb, then from the bulb it feeds the alternator through the exciter wire. #1 to the bulb, #2 to the big lug on the alternator

[@erwins.7007]

I did the same on my 76 k10 but still drawing alot of volts with the 470 resistor ?

[@NightWrencher]

The 470ohm resistor should keep voltage at a steady 13.5. Did you make sure to use a 470 and not a 470K? Also what voltage are you seeing?

[@jrobles1019]

@@NightWrencher I think what he is saying is you said your alternator does not want to see a full 12v signal coming into the brown wire on the 4prong connector. Well I’m getting the same issue he is and that a full 12v with the resistor in place when I have my switched power on.

[@NightWrencher]

You don't need to check the resistor wire for voltage, you need to check voltage at the battery. Off, battery should be around 12v and running should be around 13.5v. You might be able to see a drop in the field wire but it acts like AC because of the alternator so unless you have an o-scope, you just have to go off battery voltage.

[@irvingbar4569]

Can it run on a 12v wire

[@NightWrencher]

It can not. You WILL burn it up. Use the correct resistor.

[@irvingbar4569]

I mean run the wire with ohm resistor to a key on 12v

[@NightWrencher]

Oh, yes, it has to recieve 12v power from an isolated switched ignition source to prevent back feeding and preventing the engine from turning off.

[@jameshall9833]

What part of the ignition switch??

[@NightWrencher]

The "RUN" wire.

[@yazming1720]

How about a diagram for future reference PLEASE?

[@NightWrencher]

I didnt think I needed to post a diagram because its a really simple circuit. Ignition switch to resistor to alternator and thats it. Ill probably make one and post it on the instagram later today.

[@yazming1720]

I'll look forward to it. Gracias

[@frankrenteria4370]

How do you wire a aftermarket tach? What wire do u tap into👀

[@NightWrencher]

Most aftermarket tachs run directly off a square wave signal used by HEI style ignition systems. So most aftermarket ignition boxes, hei modules and one wire distributors produce the same wave. An aftermarket tach with have at least 3 wires. 12v ign, signal wire from ign box, coil or distributor and a ground. If it has other features like lights or sounds, itll have more wires. An MSD 6014 like the one on my LS is hooked up directly to my tach without any special adapters because the tach is designed to work with the signal the MSD box is producing

[@NightWrencher]

You can find the tach wire for your ignition box or distributor in the installation instructions

[@frankrenteria4370]

@@NightWrencher thanks for info. 💯💯💯

[@NightWrencher]

You're welcome man!

[@CamaroKevin84]

Bro u did not go into any detail as to how to make the voltage guage work. All u talked bout was the Exciter wire

[@NightWrencher]

Correct... that's what this video is about.... How to make the alternator work with a carb swapped LS with no computer...

[@chevyrellstraightdropracin0603]

🔥🔥🔥💪🏾💪🏾💪🏾

[@NightWrencher]

Thank you sir!

[@JonOffgrid]

🎉

[@cdubskiii760]

Toyota cluster

[@NightWrencher]

Yes sir, out of a 91 4runner. Toyota sensors for the gauges.

[@cdubskiii760]

Nice, I have a 95 4Runner mine is exactly the same !

[@NightWrencher]

Actually, now that I think about it it's from either a 93 or 94 because it has the electronic speedo and not the mechanical one

[@Adam_B]

Janky...

[@NightWrencher]

If it fits it ships 😂 been running for over a year no problems ;)

[@markharris5762]

Aww here we have a dipshit flapping his jaws probably running around in a bone stock civic