2009 F150 Trailer Brake Question
I just realized today that apparently there are some components to my electric trailer towing system that weren't installed at the factory. I found the bag and it contains a trailer tow wiring harness, trailer tow battery charge relay, and a trailer tow battery charge fuse.
I assume I need to install the relay and the fuse in order for my truck to charge the TT battery while I'm travelling.
My question is, what is the harness for? My running lights, brake lights, turn signals, and trailer brakes all currently function properly.
Is the harness part of the charging system also? It has 4 wires coming out labelled as follows:
Blue - to trailer electric brakes
Green - stop lamp
Red - feed wire from battery
White - ground
I'm new to all this, and learning something everyday. So, thanks in advance for the education!