Question about 1980 Chevrolet Corvette

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I have a 1980 Corvette. The battery light comes

I have a 1980 Corvette. The battery light comes on bright when I turn the ign. to On. When the motor is running, the light stays on but is not as bright. I checked Alt. output and I am getting 15.1V when the alt. is spinning. The battery reads 12.5V when the car is off. The voltage responds when I turn on the lights by dropping but comes back to 15.1 quickly. It seems that the system is working correctly but the Battery light being on (although dimmer) worries me. I don't want to be stranded somewhere. Where can I check from here?

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  • Hop31861 Dec 08, 2009

    Thanks Roniecon,

    The new alternator fixed the problem.




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The voltage is a little high.It should be at 14.25 volts,this in time will boil the acid out of the battery,the alternator has diodes in it that change the a c voltage to d c voltage,and at least on diode is bad.This is also charging the battery with some a c voltage values,not enough to worry about,except in the long run,or another diode will go out.The reason the voltage is a little to high,is because of the a c voltage,replace the alternator.

Posted on Nov 14, 2009

Testimonial: "Thanks for the information. THis sounds pretty logical. Its something no one else has come up with. I will give it a try. Steve Hopkins"


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