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Is there any power to any of the prongs with all the lights, brake light and turn signals on?How far did they rewire it?Just at the back or all the way to the dash fuse box?
Ok. More than likely you have blown fuses. Make sure all the rear lights work on the truck first before I have you chasing fuses. Please make sure all the lights work.
---back up lights
Check fuse 10, 36 and 42 in the dash fuse box. You cannot wire a 7 prong connector into a 4 prong harness.
No, just fuses. More than likely they blew the fuses. It may not have been wired properly.
See the wiring diagrams below.