GMC Topkick c8500
09-04-2021, (Subject: GMC Topkick c8500 ) 
Post: #1
GMC Topkick c8500
I know I might be grasping at straws here, but here goes. Does someone have a wiring diagram for a GMC Topkick c8500? The rear right turn signal and stop lamp stopped working. Wiring from the connector under cab to the rear has been checked and cleared as being the problem. Any help would be appreciated.
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