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I normally like to start off here.
Unplug the harness I am pointing to. There will be 4 wires in there, touch each one with a wife going to teh batery while some one else is looking at the lights out back. If your back up lights work like this, then you know the problem will be inside the cab.
Mostly I do this becouse I have a fubared back and would be pretty POd to spend an hr doing the under dash boogie just to find it was a broken wire from a hacked in trailer hitch.
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