Broken red wire in folding trailer tongue… ????

The red wire coming out of the 7 way is probably the 12v feed when the truck is in acc / or running. I added a switch box to my Puma Step Pole that uses the 7 way 12v feed to power 2 floodlights on the pole. One points down the boat and the other point down towards the hitch for hooking up in the dark. I added a Milwaukee 12v rechargeable tool battery inside the box to power the lights when the truck is not connected. The backup solenoid should be off of the blue wire as it uses the backup light circuit of the tow vehicle to activate.