GM 3-wire alternator wiring - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-27-2008, 08:36 PM
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GM 3-wire alternator wiring

alright, im runnin a 350 with a 3 wire alt. Im trying to wire this thing up and cant remember how it was wired, ( I completely rewired the entire vehicle ). I know the Bat wire runs to the starter, and i have one wire already connected to the bat terminal on the alt. like a jumper. Now the other wire is killin me. does it run through a resistor, the ign switch, the ammeter, or jus cap it off??? some detailed info for dummies would be greatly appreciated, Thanks !

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Old 12-28-2008, 09:08 AM
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Here's a picture for you that should help.
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Old 12-28-2008, 09:51 PM
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The other wire runs to the ignition through an indicator light, or if there is no light it should run through a 10 ohm resistor. If you leave out the resistor or light, the engine may not stop when you shut off the ignition.

Bruce
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Old 12-28-2008, 11:57 PM
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thanks guys, I just have it capped off for now, but the motor has only ran for about 30 seconds, and i didnt have my volt meter hooked up yet, so i dont know whats goin on, if its chargin or not. but i was just going to hook up the wire to my ign switch, so this would be a bad idea im guessin? if i leave it disconnected how it is now, does the alt still charge? or is this jus for the alt. light in the dash... jus a few q's for yall to answer, thanks.
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