7 Pin Trailer Wiring Diagram With Brakes On Trailer. When I wire up a trailer I always have a wiring diagram infront of me. Check out or trailer wiring diagrams for a quick reference on trailer wiring.
By law, trailer lighting must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals and brake lights. Trailer Wiring and Brake Control Wiring. The blue wire is usually the electric brake wire that hooks up to your electric brake controller inside of the cab.
But wiring a trailer may not be easy.
If you're towing just for the day and don't ever plan to tow again, you can pick up some adapters that replace the taillight bulbs This requires a wire from the controller to the trailer brake. (This is why some connectors have as many as seven pins, to make provisions.
Learn all about trailer wiring at HowStuffWorks. If you want to install a brake controller that's another issue wiring-wise, and there are threads here which cover that too. So far before install the junction box is a tad big, HOWEVER this is nice depending on how you plan to wire, all connectors are marked in box , comes with a diagram , comes with open/close grommets , the wires themselves are pretty heavy.