Wiring New 4-Way Connector on Trailer with 5 Wires

Question

Question:

what do color wires go to. i have on boat trailer green,white,yellow, brown with green, and brown with yellow. trying to hook to 4 flat connector

asked by: Tim

0

Expert Reply:

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 yellow for left side running lights.

If you are using a standard 4-flat connector like part # 18004, you will more than likely be able to connect color for color for the green, white, and yellow wires. As for the brown with green and the brown with yellow, these will both need to be connected to the brown wire on the new connector.

Please keep in mind that trailer wiring colors can vary so wiring by function really is the best way.

expert reply by: Leah S

0

David R.

1/12/2021

I have a Mazda Miata with the standard 4 pin connector and i Have a small cargo trailer that has 7 wires (2 red, 2 brown, 1 green,1 white and 1 yellow) that I don't understand. What kind of connector or harness do i need to buy from you. Any help is appreciated

Reply

Jon G.

1/18/2021

Does your cargo trailer only have bare wires and no connector? I would guess that your red wires are brakes, brown are running/tail, green is right turn, white is ground, and yellow is left turn. Typically stop and turn signals are combined on a trailer so if you want to go that route let me know. You will either need to find a wiring diagram for your trailer or test your wring with 12V power to verify the functions of your trailer wiring. There are common wire colors for functions but it's always best to double check by testing. Let me know what you find and we can go from there.

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Richaed L.

7/29/2024

thanks for the reply. that is what i assumed but i just needed confirmation

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Jeffrey B.

4/20/2025

Have LED lights that has red yellow white green and gray how do I hook that up to a trailer with a 4 pin

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Jameson C.

5/5/2025

@JeffreyB Each light has that many wires? I would assume the white is ground and then use a jumper wire from a 12 volt battery to test the rest of the wires to see what activates and then wire to 4-way accordingly. Traditional 4-way wiring is white ground, brown running light, green right turn stop, and yellow left turn stop.

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Answer 1

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 2

Some 5-Pole flat connectors use a total of 6 wires. They operate as follows: Blue - trailer brakes Green - right hand brake and turn signals Yellow - left hand brake and turn signals Brown/Green - right hand running lights Brown/Yellow - left hand…

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Answer 3

Since the Lippert Hydrauluic Landing Gear Feet are 12 inch in diameter and round the correct Snappads would be the part #SP74FR4.

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Answer 4

You will still be able to use the trailer with the 4-Way after installing the 4 to 5-Way adapter, #20036. First, you could just remove the adapter if you wanted to and then plug in the 4-Way like normal while stowing the adapter in the truck. The…

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Answer 5

On a 4-Way flat trailer wiring harness, white is the ground, brown is running lights, yellow is left turn signal and green is right turn signal. It sounds like your trailer has a wishbone harness. A wishbone harness splits the running light circuit…

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Answer 6

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…

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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

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 9

In regards to the Hopkins 7-Way RV Style Trailer Connector part #HM48503, the left turn "LT" and right turn "RT" signals are the only ones that should be flashing while activated. If you have other circuits flashing that means…

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Answer 10

In order to help you troubleshoot this issue I need to ask you a few questions. On the trailer, do the turn signals operate properly, meaning do they flash at the expected rate? Were the LEDs installed recently as replacements or are they the…

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Answer 11

There could be a few reasons why this is happening. The first thing I want you to do is go ahead and disconnect the trailer. Then use a circuit tester, like #PTW2979 if needed, to test the wires leading into the converter box for harness #118349. Run…

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Answer 12

That is definetly unusual for all of the lights on the Hopkins 7-Way #HM48503 to be on at the same time, as that would mean that power is getting sent to all of the pins on your vehicles 7-way connector at the same time. Since there are no lights…

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Wiring New 4-Way Connector on Trailer with 5 Wires

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