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

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.

Richaed L.

7/29/2024

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

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

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.

Mike B.

7/8/2025

Will the hot wire on a 7 way adequatly charge a 12v battery?

Jerred H.

7/8/2025

@MikeB A vehicle 7-way connector won't charge a dead battery, but it will keep the battery topped off when you are towing the trailer. We call this a maintenance charge. You're going to need to install a battery charger like the Redarc In-Vehicle BCDC Battery Charger item # 331-BCDC1225D in order to actually charge your trailer battery.

Bobby

8/27/2025

Good morning I have a highway cargo by Carson trailer and it has five wires green/brown and yellow/brown and a white wire . I’m trying to hook up a four pin connector that has four wires, green, white, yellow, and brown. Could you please help me what is the correct way to wire it up

Nick S.

8/28/2025

@Bobby Hey Bobby, going from a 5 wire system to a 4 wire you simply will just splice the brown wires together as they are the same function, and then color match the rest as they are.

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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

Did you have a 4-pin connector that had 5 wires or was it a 5-pin connector? There is a big difference since you normally see a 5-pin connector on a boat trailer with the 5th pin used for an electric reverse lockout solenoid on a brake actuating…

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Answer 3

This sounds like a ground problem on the right side. The turn signal not working makes sense because with the brake lights, there is a constant signal coming through which is enough to make the lights illuminate on both sides like they should. But…

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Answer 4

Thanks for reaching out, Shawn! You can swap out your current master cylinder for the Replacement Master Cylinder Assembly for Dexter Model 60 and Aero 7500 Brake Actuators #T4395100 to lower the hydraulic pressure so it's compatible with drum…

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Answer 6

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 7

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Answer 9

What you are describing is called a wishbone harness. This is different than a 5-Way flat connector like #A40W5B that you have referenced. A wishbone harness will have 5 wires, 2 of them going to the running light pin which is right next to the…

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Answer 10

Hey SC. So long as you can find an open spot on your frame or tongue and have tires 15" or smaller with a 4 or 5 lug nut pattern the Tie Down U-Bolt Spare Tire Mount w/ Brackets item #TD38FR will work. It clamps around 3" wide frames so…

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Answer 12

Hey Rick, yes the EcoHitch Stealth hitch part #EH57CR that you referenced does fit your 2024 Subaru Crosstrek Wilderness edition. This is a really great option to carry a bike rack. There's no trimming of the bumper required nor does the exhaust…

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Wiring New 4-Way Connector on Trailer with 5 Wires

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