Question about 1999 GMC Jimmy

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Losing all electrical on my 1999 Jimmy

After starting my truck I will lose all electrical. Nothing works, lights, flashers, doorlocks etc. I have disconnected the battery and that seems to work. The problem seems to be getting worse. Any suggestions as to why?

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  • mull8033 Feb 26, 2009

    yes, the check engine light would go on for a couple of days then off for a period of time. The losing power problem seems to have gone away, for now everything appears to be running almost normally.

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Could be a defective pcm (computer)  also bad grounds can wreak havoc on electrical systems check engine light on before this happened??

Posted on Feb 25, 2009

  • dave smith
    dave smith Feb 26, 2009

    Hey glad to here you are running again.


    Still check positive wire from battery to starter relay/solenoid.
    and go to auto zone and have them scan your pcm (computer) to check for stored trouble codes..its free!

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