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Factory Towing Wiring 1999 F-250

I just purchased this truck someone had cut the end off the factory plug at bumper and installed a round 6 pin plug. I removed 6 pin to install 7 pin that I have on all my trailers. I check all the wiring and everything I need as of now is working but the aux. wire does not have 12volt and there was one other wire that I think is reverse /backup light . Is there a fuse that I have to install to put 12 volts to aux? Wondered if anyone could provide me with a wiring diagram that would help greatly. Thanks smilieFordlogo

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