Having problems with your 1989 GMC Sierra ?

Can not get my tail lights to work onk 1989 gmc truc

\015 I have replaced head light, brake,turn switches and circut boards in rear tail lights checked grounds and all wiring when park lights are on there is power coming out of black ground wire ,power in wedge sockets at wrong places very dim lights , put brakes on with blinker all rear blink dim no tail lights at all\015 Posted / edited by AnonymousUser on : 10-12-2018

Answers :

The front park lights work correct? If the front park lights work than there is not a problem with the light switch since the brown wire from the switch supplies power to the front park lights, front side markers, and the rear taillights. There should be twelve volts on the brown wire from the headlight switch with the connector plugged in and the park lights turned on. If this is true that there is a problem with the wiring to the back of the vehicle. A thorough inspection of the harness should reveal the problem. \012\012The dim break and blinkers support the above. High resistance also know as corrosion, in the wires or connections would cause this problem.
Repair Help & Product Troubleshooting for 1989 GMC Sierra

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