I have a 2001 F 150 Supercrew with the factory hitch and wiring. The back up lights on my new trailer don't work and neither does the brake bypass. This trailer has a 5 flat plug and the Blue wire works the lights and the bypass. I can get it to work IF I unplug the trailer and plug the blue wire into the socket for the running lights. I have checked the main fuse (30 amp) under the hood and it is good. The Blue wire on the 5 flat to 7 round adaptor goes to the middle post of the 7 round. Everything else works fine. Is there somewhere else to look? Can I just run a jumper wire from one of the backup lights and jumper it to the middle wire on the truck plug? Any ideas?

Thanks.

Wayne