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How Does Trailer Running Light Circuits with Yellow/Brown and Green/Brown Wires Run to New 4-Way


Trailer wiring has a green, yellow, a yellow/ brown, green/brown, configuration. The plug that I am using is a 4 prong, 4 wires, white, yellow, green, and brown. I have connected the yellow to yellow, green to green, which activate the turn signals, and the break lights. I have been unable to activate the tail lights. The brown green, brown yellow do not activate my the tails when connected to the brown wiring on the plug connection. Would a five wire, four prong plug be a better choice. The two Browns coming out of one pole.


Expert Reply:

The yellow/brown and green/brown wires are the running light circuit on the trailer. The new 4-way that has a single brown wire can still be used but you will need to run both wires of the trailer to single brown wire on the 4-way. This is a very common way to wire up a trailer and it will work great for you.

If this configuration isn't working you will need to determine if the voltage is on the brown wire of your trailer when the running lights are on or not. If so, and still not working the issue is that the lights are grounding. If not, then the issue is corrosion, cut or exposed wire, or a blown fuse on the tow vehicle trailer wiring.

expert reply by:
Jameson C

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