Alternator Rewiring
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Junior Member
Joined: Oct 2016
Posts: 41
Likes: 2
From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Alternator Rewiring
Hey guys. I wanna redo the wiring for my alternator on my carbed 350 88 Firebird. The owners before me hacked up a lot of stuff on this car. I’ve had a lot of problems with this alternator system since I bought the car three years ago. I know that this is a three wire setup. A red thick gauge for the 12v constant, and excitement wire and a third wire thats ignition 12v key on. Right now I have a 140 amp powermaster alt on it runs great past 35mph. But it’s acting weird when I come to a red light. The volts will drop below 13 and the lights will flicker. Once I take off again the volts increase to past 13. It’s weird. So i wanna know how I can re-wire this alternator system up better to be standalone from the main harness and or the ecm too.
Thread Starter
Junior Member
Joined: Oct 2016
Posts: 41
Likes: 2
From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Joined: Dec 2004
Posts: 16,774
Likes: 1,002
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Alternator Rewiring
a smaller than stock pulley on the alternator and or crank
Thread Starter
Junior Member
Joined: Oct 2016
Posts: 41
Likes: 2
From: Corpus Christi, Texas
Car: 1988 Pontiac Firebird
Engine: 305 V8, TBI
Joined: Sep 2000
Posts: 2,504
Likes: 195
From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
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