Question about 1990 GMC Sierra
Hi, my freind has a 1990 gmc 4x4. her battery kept going dead so she replace the battery. it still goes dead after setting a few days, i think a diode is out in the alternator. the other problems are the dashlights, taillights, domelights, and now the headlights dont work. i heard something pop when i was charging the batter and turned on the headlights to see if they worked. the fuses appear good by sight. i think the fusible links could be blown because she said all the lights quit working when she put the battery in.
SOURCE: Taillight fuse locotion
The fuse-block is located on the left end of the instrument panel under a cover. (It should have a diagram on the inside as to which fuse controls which circuit). If it isn't a fuse,it may be a defective headlight switch.
Posted on Jun 26, 2008
well we just fixed our truck it was a wire that connects to the starter had some out! might want to see if there are any wires disconnected there
Posted on Dec 31, 2008
If your Sierra has a Duramax, it may be the intake air heater or the fuel heater cycling on and off in the cold weather. But if its pulling the voltage down to 12V after warmup, I would suspect a poor battery. As suggested, get a load test at autozone or ??
Posted on Jan 25, 2009
May want to look at replacing the wiper circuit board.It is located on the firewall adjacent to the wiper motor and has a some what square black cover with 3 torx screws and wireing harness pluged into the side.We had a truck that every time you washed it the wipers would stay on until it dryed out.You can try removing it and spaying it down with contact cleaner just watch the brease on the two contact tips.Well hope this helps.
Posted on Feb 05, 2010
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