Low voltage
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Junior Member
Joined: Sep 2009
Posts: 40
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From: SAN FRANCISCO
Car: 87 GTA
Engine: L98 5.7 24#inj,World hds,MSD,nosmog
Transmission: 700R4 truck clutches,Trans go shift
Axle/Gears: 10 bolt chevy 3.73 limited slip
Low voltage
I'm having an issue with the electric going dim in normal temp idle.If I have the lights on or the blinkers or the wipers ect. but when I give it gas everything brightens up again.The volt meter in the car will drop down to 9 or 10.I have a optima red top battery and a 145 amp alt.Any ideas would be highly appreciated.thanks
Supreme Member
Joined: Jul 2005
Posts: 2,123
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From: North Central Mass.
Car: 1985 Berlinetta
Engine: Megasquirted TPI
Transmission: Transgo 700R4
Axle/Gears: 3.42
Re: Low voltage
How old is the alt?
There are a few tests you can do to see if it is the alternator.
The first is to set a voltmeter on "AC" and measure the voltage coming out of the back of the alternator. There will be slight AC, but if it is more then a few millivolts it means that a diode has failed.
also, I had the same symptoms when my regulator went bad.
If you feel like rebuilding the alternator, it is really easy and pretty rewarding.
There are a few tests you can do to see if it is the alternator.
The first is to set a voltmeter on "AC" and measure the voltage coming out of the back of the alternator. There will be slight AC, but if it is more then a few millivolts it means that a diode has failed.
also, I had the same symptoms when my regulator went bad.
If you feel like rebuilding the alternator, it is really easy and pretty rewarding.
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