1990 Gmc Sierra Wiring Diagram

Is there any place that would tell me where the ground points are on a 1990 gmc sierra.

1990 gmc sierra wiring diagram. 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. Alldata gives you all available wiring diagram schematics updated four times a year to meet changing factory service and repair information. S series gmc jimmy 1989 2dr suv wiring information. 1993 gmc sonoma 2dr pickup wiring information.

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Gray right front speaker positive wire. Brown left front speaker positive wire. Light green right front speaker negative wire.