Trailer Plug is a 4-Way Flat But there are 6 Wires

Question

Question:

My trailer has a white green yellow and brown my trailer lights have a white green yellow and to Browns what do I do

asked by: Paul

0

Expert Reply:

It sounds like your trailer had a wishbone harness and/or could have multiple ground wires. On a 4-Way trailer end, the one covered pin is the ground. Next to that is the running light pin. The running light pin on some connectors will have more than 1 wire coming out. One of those wires is for the driver's side running lights and the other is for the passenger's side running lights. So it could be a situation like that.

On the actual trailer lights look at where the wires go into the lights. The functions might be labeled on the light housing.

Usually, white wires are grounds, green is right turn signal/brake lights, yellow is left turn signal/brake lights, and brown is running lights.

If you'd like you can snap some pictures of what you're seeing and email them to me.

expert reply by: Michael H

0

Micheal C.

2/11/2020

I have a trailer with a yellow, yellow brown,green, green with brown,brown wire, white how do wire to 4 wire plug.

Jacob H.

2/12/2020

It sounds like your trailer has a wishbone harness. A wishbone harness splits the running light circuit at the connector so you do not have to run a jumper from one side of the trailer to the other side. On a wishbone 4-Way connector the white wire is ground, yellow is left turn signal, yellow/brown is left side running lights, green is right turn signal, and green/brown is right side running lights. If there is a 5th pin then this most likely goes to an electric reverse lockout solenoid for hydraulic brakes, typically found on boat trailers. It could also be electric brake if the trailer is not a boat trailer but is still equipped with brakes. If the trailer is not equipped with breaks at all then it is most likely a reverse light signal. Lastly, it could be a 12V power wire run for any accessories that might be on the trailer. To wire up your trailer you will need # 20036. I have linked a helpful article to help you get it wired up correctly.

Helpful Links

faq-wiring.aspx

Wiring/Tow-Ready/20036.html

David B.

3/27/2021

Problem: 6 wires coming from trailer, 4 wires from vehicle pin connector. Solution : Simply connect colors together, All brown together with brown, and all white together with white. Green with green, yellow with yellow. Reason: Two ground (white) one for each side. Marker and tail lights (brown) one for each side. (Green) right stop and turn (Yellow) left stop and turn. On some aluminum trailers, there is no visible ground on the tongue. The ground wire runs to the individual lights, thus the need for one on each side. Source : School of Hard Knocks

Kef G.

3/30/2021

@DavidB While it's likely in your situation that matching the colors will work out, it's always important to remember that this isn't always the case. That's why we recommend verifying the functions for each wire and going that route. Sometimes the colors don't end up matching since many manufacturers like to use their own color schemes.

See All (7) Replies to Micheal C. ∨

Answer 1

I have a solution for you, but you won't want to use a 5 flat connector since the additional wire there is used for the reverse light circuit-which is not present on a 4 way flat. It looks like you've got a wishbone wiring harness with 2…

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Answer 2

Typically, the wire colors are brown for running lights, green for right turn and brake lights, and yellow for left turn and brake lights. White is ground. To confirm this on a trailer you can trace the wires back to see where they terminate or take…

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Answer 3

I do have a solution for you, however you will not be able to use a pin on your existing 4-Way for a battery charge line.In order to run charge line from the RV to your 2008 Jeep Wrangler battery, I first recommend installing the Roadmaster 6-Wire…

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Answer 4

Since you have six wires it sounds to me like you have a double ground and a left and a right side tail light wire. If this is the case you could use a wishbone harness like the 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire,…

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Answer 5

Hey, Matt! We do have an axle that is 72" for the hub face but nothing that is 72.5". All of the axles that are 72" long have a spring center of 58". This is the approximate width of your trailer. It is measured from the center of…

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Answer 6

It sounds like you need an Optronics wishbone wiring harness, part #A35W42B. This 4-Way has a prong that has two wires that come out of it. The reason some 4-Ways have two wires coming out of one port is because that prong represents the tail light…

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Answer 7

If you are wanting to install side marker lights on your motorcycle trailer that blink with the turn signal, it will need to be tapped into the turn signal/brake light wire for that side. However, just doing this will also allow the side light to…

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Answer 8

Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which…

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Answer 9

The correct replacement for your for your S2T216AP2 is #STL16RB for the passenger side and #STL17RB for the driver side.

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Answer 10

Hello George, thanks for reaching out. From what I've found online, the LED Tail Light for Trailers #STL17RB is the recommended drivers side replacement for the S2T216AP2. This is a 8-1/16" long x 2-7/8" tall x 2-13/16" deep tail…

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Answer 11

We've had similar questions in the past that used the number you referenced and we were able to determine that the taillight kit replacement was the part #TLL160RK.

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Answer 12

It sounds like you have something similar to a wishbone wiring harness with 2 running light circuits and then also 2 ground circuits. To replace this, I recommend the Hopkins Endurance Quick-Fix Replacement 4-Way Flat Trailer Connector w LED Test…

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Trailer Plug is a 4-Way Flat But there are 6 Wires

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