1991 379 electrical issues

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Coolbreezin, Oct 22, 2020.

  1. Coolbreezin

    Coolbreezin Light Load Member

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    Jun 11, 2016
    Florida
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    Hey all. My idiot lights no longer illuminate, my electric gauges no longer work and my jakebrake doesnt work. However, sometimes everything will operate correctly for about 5 miles. Ultimately my engine fan switch governs it all. I thought maybe a wire issue but bouncing has no effect. I changed the switch and no better. Sometimes it'll all start working while I sit and idle. I reached in my dash and jiggled wires around by the handfull, nothing. Since it works sporadically, it's not a fuse. Im not an electrical person. Any advice?
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    A little different deal but similar with the manual fan switch light coming on with a Pete. Make sure all the battery cable connections are clean and tight.
    Your deal sounds different but that is easy to check. The truck I worked on would shut down while driving and it had one loose battery connection. Truck had under 100,000 miles.
     
  4. Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Your going way back on me.

    Check the 150 amp breaker driver side of the dash top. See if you have good power to both sides when its broken.
     
    pushbroom Thanks this.
  5. Coolbreezin

    Coolbreezin Light Load Member

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    Jun 11, 2016
    Florida
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    If the fuse yr speaking of is popped, the dash wouldnt come to life at all. It works sporadically for a few miles.
     
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