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Have a 1978 corvette i put a new battery and alternator on it but it won't keep a charge

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You may have a current that draws current when the car is turned off.
A stuck break light switch, an interior light or a short somewhere.

Posted on Oct 11, 2010

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4 Answers

New alternator and battery. On1978 corvette won't charge


Try the regulator, If my memory serves me correctly it is a seperate box on that vehicle.

Nov 27, 2014 | 1978 Chevrolet Corvette

1 Answer

2005 corvette check charging system message


If battery was just replaced i would guess alternator. Find a local autozone and they will test it at no charge.

Aug 13, 2012 | 2005 Chevrolet Corvette

1 Answer

Car won't keep charge. Battery good and just put


may have a short in the wiring cables from the battery, trace them all back and look for breakage or corrosion

Nov 15, 2011 | 1999 Pontiac Grand Am GT

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The car was running fine one day then the next day it would not start. We tried jumping it thinking the battery might be dead and it still would niot start. The car has power until we take the jumper...


Sounds like you have a toasted battery or alternator. Have you performed a load test on the battery? Have you tried to charge the battery? First remove the battery and charge it externally from the vehicle. If the battery won't hold a charge, or won't hold a charge of 12 volts, replace it. Once you have the vehicle started, test the operation of the alternator. It should be putting out at least 13 volts back to the battery to keep it charged - if it is putting less than 13 volts or more than 16 volts, replace the alternator.

Nov 01, 2011 | 2005 Chevrolet Malibu

1 Answer

Put in a new atl wont charge


If both the alternator and the battery are good, either the alternator isn't turning fast enough (slipping belt or engine idle speed too slow), or you have a wiring problem.

To check your wiring, look for the "1" terminal on the back of the alternator (left side of spade terminal connector). When you turn the ignition key to the run position without starting the engine, the alternator warning light should be at full brightness. If the bulb is burned out, the alternator will not get the excitation current it needs to start up (it goes through the bulb). With the engine running, you should measure 12 Volts at the 1 terminal (this is the excitation terminal).

Another thing to check is whether the battery charge wire is good. If it is corroded inside at the battery clamp end or burned out, you won't get charging even though the alternator appears to be working. If you don't have an ohmmeter, you can make a quick test by adding a new 8 AWG wire between the output terminal and the battery clamp. If the battery now charges, the original wire is bad. If this works, I recommend installing an inline fuse at the alternator end no larger than the largest size used in your electrical system, just in case something happens to the jumper wire. That way you won't burn out your alternator.

The heater/AC issue could very likely be a separate problem, but inadequate power may keep that system from running properly. (Note: low idle speed or belt problems will also be detrimental to AC performance.)

Jul 10, 2011 | 1989 Chevrolet Corvette

1 Answer

Hello i put my boster cables on back words haha and it wouldnt run after so I changed my battery and altonighter and now my battery won't keep a charge it's getting charged at 11volts and now my...


It sounds like what you fried is the diodes on the alternator. You are probably due for a new alternator. On the bright side, it's much cheaper than the computer.

Jun 24, 2011 | 1998 Ford Explorer

1 Answer

Stored 2yrs. installed new battery. won't keep charged. dead next morning.


You didn't mention how far if any you drove since installing battery. First jump start, put voltmeter in battery while idling - should read 13.1v-15.8v. Anything less, replace alternator. If good, load test new battery.

Mar 21, 2011 | 1986 Chevrolet Corvette

1 Answer

1985 Corvette. Voltmeter is reading low, 11.1. What may be causing this? Time for a new battery?


This means that your alternator is not charging anymore and likely needs to be replaced. You may want to have the battery charged then checked as well. Sometimes a failing battery can cause the alternator to fail because they require a higher charging cycle that can prematurely burn out the alternator.

Feb 04, 2011 | 1985 Chevrolet Corvette

1 Answer

I have a 1994 Corvette, the battery is new and


Usually the regulator is built in to the alternator..........have the amps checked on the alternator the volts are not the only sign of charge

Jul 06, 2010 | 1994 Chevrolet Corvette

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