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  1. #1

    Default electrical problems 1985 GMC SIERRA

    hey folks! im new to your forum an a BIG thanks for havin this. ive had this truck for about 8 months with zero problems. as of last week, the radio is blowin fuses shortly after you put a new one in (about 2 mins), the dash lights went out and the tail lights are only workin when i mash the brake pedal. im in the process of restoring this truck as it is 4X4, auto, a/c and in fairly good shape. im excellent with mechanical stuff but this HELLelectrical stuff is not my jig. thanks in advance for your help! chris

  2. #2
    Sr. Mechanic LSU truckman's Avatar
    Join Date
    Jan 2011
    SouthWest Louisiana


    Check the ground strap from the firewall to the engine or frame. I had similar problems like that and it turned out my ground strap was broken.

    Current Motorvation:
    2011 GMC 1500 4x4 crew / 5.3, 6spd, 342 rears, g80 locker, bone stock
    2000 Chevy Silverado Excab / 5.3, 373 rears, g80 locker, 93 oct perf. tune
    2011 GMC Acadia Denali wifes ride

  3. #3


    grounds are good. i changed the headlight switch last night. i had a t/l and courtesy fuse and radio fuse blown. this could be awful to find.

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