Question about 1982 Chevrolet El Camino

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Volts problem 79 El Camino. My gage is only reading 12 volts or less. which I believe means its just drawing from the battery and not using the alternator. I know the alt is good though because I just replaced it and had it tested bore I bought it. Also the batter is new. I replaced the positive cable to the starter and re grounded everything I could find. please help!!!

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  • Dean Lamke
    Dean Lamke Mar 22, 2014

    also if I disconect the positive after starting the vehicle it dies. Shouldt the alt keep it running. its new and works so i dont understand the problem



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The best way to find if you have a short/draw being taken from the battery is to shut off everything in your car open your hood and close your doors in case you have a dome light that comes on when the door is open .Then take and disconnect the ground cable from the battery hook up a test light from the positive post and touch it to the disconnected ground cable if the light comes on you have a short now all you need to do is start pulling fuses until the light goes out then you know on which circuit your short is on.

Posted on Mar 22, 2014

  • Denis Houle
    Denis Houle Mar 22, 2014

    a short circuit blow fuse.... a current draw pull down the battery voltage overnight.alternator look for not charging.Sometimes you change a alternator because the batt is dead engine running


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  • Chevrolet Master
  • 1,279 Answers

First you have to know the voltage at battery pole.
second voltage at block fuse
third voltage at alternator batt. pole
if there small difference alternator not charging
or voltage at fuse gauge and at the gauge
you will find out your problems
hope it helps

Posted on Mar 22, 2014


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SOURCE: motor rolls over slowly like drained battery or bad starter

Has timeing been checked and how does vehicle run

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SOURCE: 84 CK TRK, 2500, 5.7L 55,000 miles have replaced

On some of the older style GM's you can take that brown wire and cut it and take the end leading from the alternator and hook it directly to the hot terminal on the alternator and just leave it hooked up and it will work. But I have ran into the occasional problem where leaving it hooked up will drain the battery when the vehicle isn't running. Hope this helps..

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Testimonial: "I fixed the problem - the terminal at the brown wire was corroded - after cleaning and recrimping - everything works - thanks for the heads up"

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SOURCE: I have a 79 Chevy truck and the alternator charges at 12.5 volts

Try a 2nd hand guage from a wreckers yard. Guages fault as well

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SOURCE: 305 engine --The volts gage is dropping-- HELP

The gauge could be wrong,it could be defective,have the alternator checked,at the battery,it should read from 13.65 volts to 14.25 volts with the head lights on,and the ac blower on high,with the engine running.If the alternator is new,check for 12 volts at the back of the alternator with engine off,if there is not 12 volts on the large wire,on the alternator,then the circuit is broken somewhere.Just install a new wire,of equal or larger size.Leave the original wire on the alternator,and just add a new wire,larger would be better if possible,and run it from the alternator,to the positive side of the battery,it will fix the problem.

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SOURCE: 1993 chevy 1500 p/u. Alternator only placing 12.5

13.5 is what it should be at all times not 14.5 so the regulator is not functioning correctly . Reversing the probes on the volt meter will tell you the doide is bad if the reading is showing the same results as properly connected

Posted on Jun 15, 2010

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