Load Trail Trailer Wiring Diagram. Not sure which wires attach to what on your trailer connectors? Click on the image to enlarge, and then save it to your computer by right clicking on the image.
By law, trailer lights must be connected into the tow vehicle's wiring system to provide trailer running lights, turn signals, and brake lights. Trailer Wiring Diagrams showing you the typical wiring for most single axle trailer and tandem axle trailers. Diagrams are looking from the outside of the plug or socket.
To begin with, knowing the diagram of cables for trailer will be useful during troubleshooting.
Possible overload of too many lights on the trailer.
Calculate the amp load your trailer is pulling, see. It's crucial to diagnose a trailer wiring problem early. This is a short video series of the steps that I have taken to refurbish and old Utility Trailer that was designed and built by my father.