Question about 1978 Chevrolet Corvette

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New alternator and battery. On1978 corvette won't charge

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How do you know it's not charging? Use a volt meter (not the one on the dash) and check voltage at the battery when it's not running, and then start it. The voltage should read above >13.4V. while running.
If you don't have a volt meter you can start that particular Corvette, and while it's running, remove the (-) negative cable on the battery. If the engine dies, the alternator is not charging. If the engine continues to run when you remove the (-) NEG cable, the alternator is charging.

The alternator has 2 important wires. A larger red one which is battery power, and a smaller switch wire attached at a 2 prong connector with another smaller wire which sends a signal to the dash light. Make sure the larger wire has battery voltage and at least one of the two wires also has battery voltage when the ignition is in the ON position.

Posted on Nov 27, 2014

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According to the wiring diagrams it is a very simple setup so what can go wrong. Check all the connections and clean all the grounds. Make sure the alternator is actually working. Inspect all the wiring that was touched or moved during the replacement.

Posted on Nov 27, 2014

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Voltage testor on alternator should be about 14v. Most likely problem is connection in guages or electrical system. Check fuses and ensure voltage at battery when battery is disconnected and engine running is 14v. If you dont have good voltage step back through system from battery to alternator until fault is found.

Posted on Nov 27, 2014

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

Posted on Nov 27, 2014

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Posted on Jan 02, 2017

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SOURCE: why won't my new alternator charge my new battery

the power wire for that lays on top the intake probly has bad spot drawing out the current

Posted on Apr 08, 2009

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SOURCE: 2001 Kia Sportge :new battery, new alternator no charge current.

there is a main fuse in the box for the alternator it is held in by screws its one of the huge ones check this fuse

Posted on Aug 05, 2009

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SOURCE: new battery, new alternator still won`t hold a

You must have a bad gound somewhere or faulty wiring. Your not able to get current from your new alternator over to your new battery properly.
Source could be poor or dirty conections, a corroded ground wire or a bad conector at the alternator itself.

Posted on Oct 08, 2009

  • 200 Answers

SOURCE: 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

Posted on Jul 07, 2010

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SOURCE: Have New battery and Alternator,

Since you are having a new battery and alternator the charging circuit of the electronic charging unit is a possible suspect.
All what is required is to check the charging voltage when the engine is started, if there is no increment of voltage when the engine runs the alternator then the connection from the alternator must be checked. Check the output from alternator, check the relay box which contains the charging unit. It can be a failure of the rectification or the stabilising circuit, the unit must be replaced.

Posted on Sep 21, 2011

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2 Answers

Charging system 89 corvette

Is the charge indicator light lit on the insturment cluster ? (battery symbol ) Did you check for B+ voltage on the bigger wire on the back of the alternator ? The S terminal in the connector should have B+ voltage ,as well as the F an L terminals . No battery voltage at any of these will cause it not to work . Do you know what a wiring diagram is ? Free wiring diagrams here Enter vehicle info. Year , make , model an engine . Under system click on engine ,then under subsystem click on charging system . Then click the search button , then on the blue link . This diagram show all connection's on the alternator . All wire's should have B+ voltage , testing with a volt meter . Could have blown fuse , fusible link etc...

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I have a 1976 Stingray Corvette. Was sitting for over 1 1/2' in the garage. I tried to start it and it needed a new battery. I place a new battery it started up. After a few weeks now the car does not

You have an alternating problem..I assume on a 76 model you have an internal regulator...if you have no voltage meter then charge your battery and start the var then pull positive battery terminal...if car dies,alternator is bad and needs replacing.If it stays running your at least putting out some voltage but might not be enough...most parts stores(Auto Zone,ect)will do a free voltage check(on or off vehicle)

Aug 12, 2014 | 1976 Chevrolet Corvette

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1991 battery indicator light is on

replace the alternator, its guilty as charged, no pun intended.

Feb 20, 2013 | 1991 Chevrolet Corvette

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Battery light is on a 1998 cavalier. alternator won't charge. has new battery and alternator


Jan 19, 2013 | 1998 Chevrolet Cavalier

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2007 Corvette new battery will not hold a charge. Will charge overnight and start. Sits overnight and dead. Why?

There's a draw on the system. you'll need to have it diagnosed for electrical. Could be the alternator - bad diode in mine caused it to kill the battery.

There's a LOT of stuff on Vette's that could cause this.

Oct 06, 2012 | 2007 Chevrolet Corvette Coupe

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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

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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

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

2 Answers

Charging system fault

Yup, that won't be enough as it is normal battery voltage. You need 13.8 to 14.8 or so. Pull the alternator and get it bench tested. Alternators have diodes inside (one way valve for electricity, that converts alternating current to direct current, which your car is). and these diodes fail and leak. There is a set that turns on the regulator that fail..

All will have the same result. rebuild the alternator.

If it bench tests okay, be sure to guarantee good ground cuicuit.

Jul 15, 2010 | 1999 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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