Speedo jumps around occaisionally and sometimes nothing. I can hear it tick from time to time. Odometer and cruise control works no problems. I checked the vss and it seems to be fine (or the odo and cruise wouldn't work) The gauges are electronic. It's a 1990 4x4 with a 700r4 and tbi sbc........ I have searched for weeks and can't come up with anything, please help. Thanks, Adam
SOURCE: electrical ?
probally need to check engine groundwires. clean all terminals. battery may have loose terminal.
SOURCE: speedomerter and odometer are not working
You have a bad "speed sensor". It's located in the transmission. Your speedometer and odometer are not cable controlled, they are electronically controlled by your speed sensor.
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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