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.

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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.

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Joel P.

8/24/2020

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

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Answer 1

The 4-way on your trailer is what's known as a wishbone connector like part #A35W42B. Two of the wires are the running light circuit which is a little easier to install since you can run one down each side of the trailer. This way you…

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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 3

I've linked a help article that will give you the common color coding but on your trailer I wouldn't go by it. Even if they are correct you just never know so I suggest testing it. To test it cut off the 5-way connector that's…

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Answer 4

It could be possible that your 2012 Boat trailer is wired with a wishbone style harness. Similar to Item #A25W2GWB. This type of harness just allows the installer to run each side separate rather than splicing and running extra wires across the…

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Answer 5

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 6

When wiring a 7-Way on your trailer with 5 wires, your green wire will be right turn/brake, the yellow wire will be left turn/brake, the brown wire will be the taillights, and the white wire will be the ground. You will want to find out if the blue…

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Answer 7

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 8

The best solution for your situation would be to use a circuit tester, like part #PTW2993, to wire your trailer wires to a seven-way trailer connector, like part #A7WCB. Wiring by function is the best way to make sure you have the trailer connector…

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Answer 9

In order to replace the taillight on a Trail Star Trailer you'd simply find one with the same style (shape/function) and then choose the correct replacement based on size. There are several types of Trail Star Trailers so it would be difficult to…

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Answer 10

That's the most wires I've seen ran to a 5-way connector! Looks like you have several white ground wires, a running light circuit that runs to each side with the brown/green and brown/yellow, left and right stop/turn circuits, and then two…

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Answer 11

Since this is on a boat trailer the 2 additional white ground wires are ground for the lights. This is fairly common on aluminum frames and boat trailers in general because aluminum is a poor metal for grounds and lights grounded near the tail lights…

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Answer 12

What you have is a wishbone style of 5-way that has the ground and running light circuit split for either side of the trailer. You can replace this setup with one that has a single wire by running both of the wires on the trailer side to the new…

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Why Does Trailer's Wiring have Two Brown Wires

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