battery or altenator?
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Joined: Feb 2006
Posts: 682
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From: newcomerstown,o
Car: 91 formula
Engine: 350 tpi
Transmission: auto
Axle/Gears: poss
battery or altenator?
i cant use headlites ,heater and wipers at same time cuz lights get real dim and volt guage plummets. which one do i need to replace?
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Joined: May 2012
Posts: 125
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From: SOUTH TEXAS
Car: 1991 Trans Am GTA
Engine: LT-1
Transmission: 700R4
Axle/Gears: 3.42
Re: battery or altenator?
MOst likely you alternator. Turn on car get a voltage tester and test voltage at battery. If your getting above 13 volts it should be good.
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From: Mississauga,Ont,Canada
Car: 89 IROC
Engine: LSX 6.0 370, TU2 Cam, Fast intake
Transmission: T56 w/ lots of goodies
Axle/Gears: 8.8, Posi, 4.10, 31 Spline
Re: battery or altenator?
could be a combination of both tho as ive had it happen. Replaced the alt then the batt wouldnt hold a charge a week later. How old are they?
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From: Brighton, CO
Car: '72 Chevy Nova
Engine: Solid roller 355
Transmission: TH350
Axle/Gears: 8.5" 10-bolt 3.73 Posi
Re: battery or altenator?
If you're loosing power while the car is running, the problem is most likely the alternator. If the battery can still crank the starter and start the car it's probably not the issue. I'd bet it's your alt. Take it to autozone and have them test it along with the battery, that'll tell you the problem.
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