What are the Functions of Trailer Light Green, Yellow, and Brown Wires

Question

Question:

Installing turn lights to a 4 flat trailer. Old original lights have 3 leads, Red, black and green. New Right side wires are Green and brown. New left side wires are yellow and brown. Which colors should be spliced together?

asked by: William I

0

Expert Reply:

Normally, the green wire on the right side carries right turn signal and brake light functions and the brown wire carries running light functions. On the left side, the yellow wire carries left turn and brake lights and the brown wire again carries the running lights. With only 2 wires, these lights must ground through the mounting studs.

Make sure to wire in the new lights by function to the existing trailer wiring and not by color.

expert reply by: Michael H

0

Line C.

5/24/2020

Hi! I only have 3 wires on the trailer (brown, white, green) and 4 on my Chevy van.. extra red.. How do I plug it in ? Thanks!

Reply

Chris R.

5/27/2020

The wires on your trailer aren't standard, so I really can't be sure how they would be hooked up to new lights or even up to a 4-Way connector. If the white wire is for ground, you're missing a wire. Is this a new (to you) trailer or are you simply re-wiring the setup? How did the signal lights work before if it's something you've had for a while?

Reply

Roger

6/1/2025

Appreciate your help! I’m wiring My boat trailer lights to the usual flat four plug I understand the color arrangements green yellow brown and white. However one wire is green on one side and brown on the other side. Where is it supposed to hook into? I have it with the green it’s that correct? Or brown? Or is it meant for a five flat? Thanks. Roger C ???

Reply

Robin H.

6/3/2025

@Roger a 5-way typically has a blue wire that would run to an electric lockout on a brake actuator. Wiring colors aren't always absolute but typically you have green for the right turn/stop and yellow for the left turn/stop with brown for the running lights. Do you have a brown wire instead of the yellow? How many wires are there total? If you have multiple brown wires it is still a 4-way but designed to run down both sides to make hooking up the running lights easier. If you are trying to tie in the existing wires on the trailer to a new 4-way connector I would simply trace the function to figure it out.

Reply

Answer 1

Hey Darryn, the etrailer winch part #e75VV that you referenced has a capacity of 1,500 lb which isn't quite high enough unless you have roller bunks. For wood bunks with a normal winching distance the ratio of winch capacity to boat weight is 2…

view full answer...

Answer 2

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…

view full answer...

Answer 3

Hey Johnathan, thanks for reaching out. If you want to stick with the 4.80-12 tires we do have the Kenda K353 Bias Trailer Tire - 4.80-12 - Load Range C #AM10062 which is rated for 65 mph. That will be the highest speed rating available for that tire…

view full answer...

Answer 4

Hey Bruce, it sounds like you might have some older seals, perhaps Transcom seals with the 1.983" OD. We do have one seal, the #10-9 seal, which has proven to be a suitable replacement for these seals. This is a double lip seal with a 1.5"…

view full answer...

Answer 5

Hey Bob, yes the Rambler trailer tire part #TA89GR that is the size ST145/R12 does fit the same wheel size as what you have now as both fit 4 inch wide 12 inch diameter wheel.

view full answer...

Answer 6

Hey Zack, Because of the speed rating you're looking for you'll be limited to the Taskmaster #TA69QR (Silver) or #TA79QR (White) if you have a 4 on 4 wheel bolt pattern. If you have a 5 on 4.5 bolt pattern then you'll need the #TT53012C…

view full answer...

Answer 7

The size winch that you will need depends on a couple of different factors. I have included part of our hand winch FAQ below regarding boat winches and have linked the FAQ article for you to view. Finding the Right Capacity Winch for your Boat…

view full answer...

Answer 8

If your races are #L44610, which they almost certainly are, you will want the following parts: Bearings: Inner bearing: #L44649 Outer bearing: #L44649 Grease seal: #10-9 Outer diameter: 1.987" Inner diameter: 1.5" Grease cap: 1.986"…

view full answer...

Answer 9

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…

view full answer...

Answer 10

Hello Stuart, thanks for getting in touch. We have a great option for you. According to the Dexstar catalogue, the 17-228 is a silver mod wheel with a 5 on 4-1/2" bolt pattern and no offset. We have a very similar silver mod wheel from…

view full answer...

Answer 11

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…

view full answer...

Answer 12

Hey Kyle! The Thermostat for Furrion Chill Cube Ducted RV Air Conditioners #LC74DX would replace your existing Dometic thermostat. Your old thermostat won't be compatible with the system since it was designed for the old R410A units and…

view full answer...

What are the Functions of Trailer Light Green, Yellow, and Brown Wires

Product Page this Question was Asked From

Continue Researching