TAIL LIGHTS AND HEADLIGHTS
SOURCE: 1990 GMC Suburban Wiring Problem
Have a Surban that did the same thing .. problem was the wiring harness for a trailor if your vehicle is equiped with it.
SOURCE: Marker lights, tail lights and dash lights do not work
I had a similar nagging problem once, though I do not recall the dashlights being involved. For me, the lines from the brakes went up the steering column to the turn signal. I pulled the wheel and inspected all the connections, and just like that everything worked again. I believe I could have tugged on the wiring harness without pulling hte wheel and obtained the same results.
SOURCE: tail lights work on both sides. turn signal and
check fuse to driver side turn signal lamp.check brake light bulb or replace bulb on driver side.also replace the front driver side turn signal bulb that is flashing fast.
SOURCE: 1990 GMC Sierra 1500 pickup. Windshield wipers, Cruise Control
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.
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