1990 Gmc Sierra Radio Wiring Diagram
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It makes the process of assembling circuit easier. 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. Tan left front speaker negative wire. Orange radio accessory switched 12v wire.
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