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Wiring New 4-Way to Trailer with 5 Wires Ran to 4-Way

Question:

When I bought the used trailer I had a very badly damaged connector that I wanted to replace. Trailer has white, brown-yellow, brown-green. 5-plug. Truck is a new 2018 Chevy Silverado with 4-flat wiring, white, brown, yellow and green. 4-flat plug. I have an adapter thats suppose to allow me to go from a 4-flat to a 5-flat trailer. It has a separate blue wire. But, trailer doesnt have a blue wire. I matched white for white, green for green, yellow for yellow, and the other brown to the blue thats not connected to anything. Result is... brake lights, turn signals, running lights on one side of trailer.

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Expert Reply:

Your trailer with 5 wires does not need a 5-way. It needs both of the running light circuit wires brown/green and brown/yellow ran to the same brown wire on the trailer wiring. This will allow both sides of the running lights circuit to function.

expert reply by:
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Jameson C

Question:

Jameson, are you saying I need to split the brown/yellow (tying the brown portion to brown wire and yellow to yellow) and split the brown/green (tying the brown portion to the other two browns and the green wire to green)? Or, are you saying the take the combo brown/yellow and combo brown/green and connect them to the brown wire? I did the first scenario but still don't have running lights.

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Expert Reply:

The brown/yellow and the brown/green get ran to the single brown wire and you'd have running lights.

expert reply by:
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Jameson C

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