Why Does Trailer's Wiring have Two Brown Wires

Question

Question:

The wires from the trailer are yellow, green, and two brown. The green and yellow ones are paired with a brown wire. The harness has green, yellow, brown, and white. Do you know how I can match these up?

asked by: Rick

0

Expert Reply:

The brown (running light) wires all run to each other as they carry the same circuit. The reason there is two browns on the trailer side is because there are running lights that are on both sides of the trailer.

Aside from that all the rest of the colors match with the white running to the trailer frame as a ground.

expert reply by: Jameson C

0

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Joel P.

8/10/2020

I don’t think you answered his question. He’s asking about trailers that havent spliced the two brown wires into one wire. He’s asking how does he match up these two wires coming out of the trailer harness to one receptacle at the trailer hook up on his truck. I.e. does he have to splice and solder the wire or is there another way to connect the 2 to 1 plug. I have a similar trailer with two brown wires one yellow one green and the ground white.

Jon G.

8/24/2020

Soldering the wires together and protecting them with a heat shrink like part # DW05452 (slid over the wires previous to soldering) is the best way to make your wire connections. Not everyone is comfortable with this method though so in that case you can use butt connectors # DW05744-5 and put both brown wires that run down the sides of your trailer for the running lights in one end while you have the other brown wire that goes to the trailer connector in the other end. If you have a 7-Way on your trailer then using a junction box like # 3430001-JBK makes this a lot easier.

Joel P.

8/24/2020

Thanks-I soldered like you described and it worked well.

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Answer 2

There should be five wires on your trailer side connector, a white wire which is for a ground, the yellow/brown and green/brown are for the running lights, a green wire for the right turn/stop light, and a yellow wire for the left turn/stop light…

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Answer 4

Red, black, and white wires are common on many tail light assemblies. When this is the case, you will have red as stop and turn, black as running light, and white as ground. So you will connect yellow to red on one side of the trailer and green to…

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Answer 5

What you have a is a 4-way Wishbone trailer connector like part #A35W42B. The two brown wires are both the running light circuits. One needs to ran to each side of the trailer. This makes the wiring a little easier instead of having to run the brown…

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Answer 6

Going by the colors that you mentioned, it sounds like you have the typical set-up, green wire for right turn and brake, white wire for ground, yellow wire for left turn and brake, brown with green wire for right side running lights, and brown with…

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Answer 7

You have it right so far, the 4-way connector is just as you have stated. Remember that Yellow has a L in it so that is the left side brake/turn signal and green has a R in it so that is the right side brake/turn signal. The colors for wiring a 7-way…

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Answer 8

It sounds like the old connector on your trailer was a wishbone harness, which has two brown wires for the running light circuit (one for each side of the trailer) and the standard wires beyond that. To replace the connector with a traditional 4-Way…

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Answer 10

If it was a 4-pin connector with 5 wires then it is called a wishbone harness and would have 2 wires attached to the running light pin so you have one wire for each side of the trailer. Typically, on a 4-Way, the white wire is ground, brown is…

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Answer 11

The brown/green and brown/yellow wires on your trailer are for the same running light circuit. You would need to run them both to the brown wire of the 4-way.

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Answer 12

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Why Does Trailer's Wiring have Two Brown Wires

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