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There should be a ground wire from the battery to the engine. There should be a ground strap from the passenger rear engine head to the firewall. There should be a ground from the driver front engine head to the frame rail.
There should also be a sheet-metal ground from both rear light assemblies to the body.
Ok... I went ahead and made a small incision in the cover. Here is what I found:-Yellow wire is hot (blinking) when you signal left.-Dk Green wire is hot (blinking) when you signal right.-Lt Green is hot (blinking) when you signal left. Lt Green is dead when you signal right.-Brown (at license plate wire) is hot when running lights on.-All wires hot when pressing brake or hazards engaged. **-I removed the ground right behind the driver tail light, everything still works (albeit wrong) even though it is not grounded there? **
lights off and in reverse light up both B/U lights and both tail lights. **Wait, doesn't that suggest that I have a short between the LT Green and the Brown as well as a short between the Yellow and Lt Green?
Trucks only have one ground, behind the driver side tail light.... Mine has bare metal showing.
I tested the plug from the cab... post #18 and #24 light up when I signal left.
...it could be that the backup light wire and the [left turn] wire are shorted to each other somewhere in the run back....
...I tested the plug from the cab at the rear of the truck, I performed no test at the bulkhead connector. The bulkhead still has all the "goo" on all the wires protecting it from elements.... How would one test the bulkhead connection with the goo still there?