This Old Trailer: Repairing a Trailer Light Wiring Problem Video

You are on the right track, but typically when a trailer's running lights don't function it's because of a weak ground on the trailer. Make sure that the trailer and vehicle side connector are clean and free of corrosion inside and out.…

The first thing I would do is check to see if there is a jumper wire from the working left side tail light wire going to the right side that is not working and check that wire for voltage. You may find that the tail light jumper is damaged and will…

Whether the trailer wiring is the 4-pole flat format like #A35W42B or the 7-way format like #H20046 the tail and clearance light signals for the trailer are carried on one circuit, which means one specific wire and one specific pin. In 4-pole wiring…

The purple wire of a 7-way is traditionally used for reverse lights and is the center pin of the connector. If you are looking for a 12 volt circuit to use with a toggle switch you would want to use the circuit in the 1:00 position as this is…

When wiring a trailer connector, it is best to wire by function, as wire colors can vary. We have an excellent wiring diagram on our website, I will provide you a link so you can look at it. If you are looking at the inside of the trailer connector…

Typically trailer wiring is color coded. The brake circuit is usually a blue wire which travels to each brake magnet, where it is attached to one wire from each brake magnet. The other wire from each brake magnet will ground to the trailer frame. I…