Question about 1993 GMC Sierra K1500

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Alternator overcharging i have a 1994 gmc 1500 that is overcharging as soon as you start it, the alternator and ecm have already been replaced with the same results, any info would be helpfull, thanks

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  • amarine Nov 25, 2008

    thought the regulator was in the ecm

  • amarine Dec 01, 2008

    on the 3rd alternator, as soon as you plug in the sensor wire the alternator kicks on fully and wont stop

  • Jai Bennett May 11, 2010

    ecm = engine controll module, this is basically the the computer that tells your engine when to do stuff.

    the charge regulator is sometimes built into the back of the alternator

  • Jai Bennett May 11, 2010

    did you swap out the charging regulator?


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Ok, there is an earth wire between the engine and the body (usually bolted to the exhaust manifold), you need to undo it from the body, and with a piece of sandpaper or a file, you need to clear away the paint from under where the wire connects to the body, (might be a bad earth giving a faulty sensor reading, because on the production line the body is painted before anything else is fitted), clean the end of the earth wire contact and re-connect.

if you still have the same problem, you need to see an auto electrician or your nearest dealer.

Posted on Dec 03, 2008

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