You have what is called a wishbone harness like # A20WB. This type of harness take the running light circuit and splits it at the trailer connector so that you do not have to run a jumper wire from one tail light to the other. The yellow/brown wire is the running light circuit for the driver side.
Full Answer
How do wishbones work?
The innovative wishbone design takes the running light circuit and splits it at the trailer connector so you do not have to run a jumper wire from one taillight to the other. To further simplify the installation process, our kit features color coded 18 AWG wires for safely determining each wire’s function.
What size wire do I need for a trailer harness?
Long total wire length (25' plus 4') make this trailer harness kit perfect for trailers measuring under or over 80" wide. The innovative wishbone design takes the running light circuit and splits it at the trailer connector so you do not have to run a jumper wire from one taillight to the other.
How does a tail light harness work on a trailer?
This type of harness take the running light circuit and splits it at the trailer connector so that you do not have to run a jumper wire from one tail light to the other. The yellow/brown wire is the running light circuit for the driver side. The green/brown wire is the running light circuit for the passenger side.
What are the Green and brown wires for on a trailer?
The green/brown wire is the running light circuit for the passenger side. Either of these wires will carry the running lights for the trailer, they are just split to make it easier to wire to the tail lights. Many trailer lights ground through the mounting hardware if there is not a ground wire present.
What are the different types of trailer connectors?
There are two different types of 7-way connectors, one with flat pins (blades) and one with round pins. The round pin connectors are very uncommon, while flat pins are common and often found on newer SUVs and trucks that come from the factory rigged with a trailer hitch.
Why does my 4 pin trailer connector have 5 wires?
What is the Function of the 5th Pin on a Trailer Connector 5-Way Flat Connector The 5th wire on a 5-Way flat connector is intended to connect to the vehicle's reverse light circuit. This is for the exact situation you described, so the 5th wire can signal a surge coupler's electric reverse lockout.
Why is there 2 brown wires on trailer?
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.
What is yellow wire for on trailer brakes?
Trailer Wiring Colors Each connects to a different function: Brown wire to the tail or parking lights. Green wire to right turn signal/brake light. Yellow wire to the left turn signal/brake light.
What is the difference between a 4 wire and 5 wire trailer plug?
1:473:305 Wire Trailer vs 4 Wire Trailer Lighting - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe five wire function of the trailer. You will need to eliminate the converter by either cuttingMoreThe five wire function of the trailer. You will need to eliminate the converter by either cutting off the wires. And hooking up a flat five plug directly to those five wires to the vehicle.
What is the difference between a 4-pin and 5 pin trailer plug?
5-pin trailer wiring is very similar to 4-pin wiring, but it adds in a blue wire for the reverse or backup lights. Not all trailers have reverse lights, so consider your own trailer as you wire in a 5-way plug.
Will trailer lights work if not grounded?
It needs to ground through the wiring of the trailer harness. You can test this by setting the coupler on the ball and if it works you know the ground of the trailer needs to be improved. Otherwise you'll get intermittent lighting functions when your trailer hits bumps.
What is the black wire on trailer lights?
Red, Black, and White Wire Functions on Old Trailer Light It is likely that the red wire on your old lights is the turn signal/brake light wire and the black wire is the running light wire. That would make the white wire the ground.
Does a trailer ground through the ball?
The ground is made through the hitch ball on many trailers. The vehicle body and the car's drive train are all grounded. When a trailer hitch is attached to the vehicle frame it becomes grounded, too. If the ball and trailer coupler become rusted when not in use, the surface will not allow a good ground connection.
What is the color code for trailer wires?
Trailer Wiring Has 5-Wires White, Yellow, Green, Yellow/Brown, and Green/Brown 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.
What color wire runs trailer brakes?
If a trailer has brakes, then it needs a connector with at least 5 pins. The 5th pin, a blue wire, gives power to operate (or disable) the trailer brakes. Traditional Trailer + with Brakes = Use a 5-Pin Connector. 1-4 Wire the first 4 pins (White, Brown, Yellow, Green) just like the 4-pin connector above.
Where does yellow wire go on trailer lights?
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.
What are the 5 wires on a trailer plug?
Trailer Wiring Has 5-Wires White, Yellow, Green, Yellow/Brown, and Green/Brown. Expert Reply: 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.
How do you wire a 7 pin trailer plug with 5 wires?
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.
How many wires do you need to wire a trailer?
At a minimum, all trailers need at least 4 functions: Tail lights, Brake lights, Left & Right signals. 4 wires will give these functions, so the simplest scheme is a 4-pin connector. The most common 4 wire connector is the 4-Pin Flat Connector as shown here.
Can you ground to aluminum trailer?
Helpful Expert Reply: Aluminum trailer frames or bodies can cause grounding issues so I suggest using a separate ground wire that runs from the rear of the trailer up to the main ground post in the junction box like # 38656.
What is the yellow wire on a trailer?
The yellow/brown wire is the running light circuit for the driver side. The green/brown wire is the running light circuit for the passenger side. Either of these wires will carry the running lights for the trailer, they are just split to make it easier to wire to the tail lights.
Do trailer lights need to be grounded?
Many trailer lights ground through the mounting hardware if there is not a ground wire present. All lights will need to be grounded. If you have a lot of extra running lights, they may be too much of a power draw for the vehicle wiring system to handle and thus they will not power on.
Product Description
4-Way flat trailer end connectors, wishbone style4-way flat 25 ft. Trailer endwishbone harness3 ft. ground. Color coded 18 gauge bonded wires.
Compare with similar items
I've ordered this very item probably 10 times in the last 2 years and always gotten a Wesbar brand wiring harness in retail packaging. This time I got what appears to be a cheap made in Taiwan knockoff.
What wire controls the blinker on a trailer?
The green wire will control the right blinker of the trailer.
What is the blue wire on a trailer?
The blue wire is the wire that is going to help control and power the mist lights on the trailer.
How to Wire Your Car or Truck to Pull a Trailer?
Perhaps the quickest way to wire a car or truck is to purchase a T-One Connector.
How to Protect the Wires?
Since trailer wiring is pretty exposed, it is important that you learn how to protect it. If you don’t, then you will probably be replacing your trailer wiring far more often than you would like.
How many amps does a 7 pin trailer plug have?
How many amps does a 7 pin trailer plug? The vast majority of 7 pin trailer should be 20-amps or 30-amps, though. It is rare that they are going to be any different. You don’t really want anything under 20-amps because there wouldn’t be enough power to keep the trailer lights running.
What is the job of a trailer wiring adapter?
The job of a trailer wiring adapter is to convert certain trailer wiring configurations to other wiring configurations.
How many wires are in a 4 pin trailer?
4-pin trailer wiring is the simplest to understand. As the name suggests, there are four wires here. The white wire will be the ground wire.
Optronics 25 Ft 4-Way Wishbone Style Wiring Kit
Optronics 25 Foot Split Wishbone Four-Conductor Harness. Includes 4' trunk connector and clam pack.
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