We need to know the color code on the wires to hook up tail lights to a trailer.

Sidelight, break light, turn signal. You can use a test meter to identify.

What is the color code for trailer wiring? 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.

Standard Color Code for Wiring Simple 4 Wire Trailer Lighting ...

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We do not have the wiring diagrams. But here is the red neck method, use a 12 volt test light probe tool (any parts stores for $5) and as a friend operates each light circuit, probe the connector or harness and see what lights up, then mark the wire color and what it does, brake lights, turn signals etc.

Test the wires on the car and ID each ones function, brake light, tail light and so on, hook up to the correct wire on the trailer harness which does have a wiring diagram.

brake lights, white/tan stripe
tail lights, black/yellow stripe
left turn, light green
right turn, tan
ground, black

Note that your car has separate filaments for brakes and turns, so you cannot use the standard 4-prong trailer connector and will need an extra filament in your trailer lights.
Please let me know if you have questions, and thanks for using FixYa.

A test light checking each connector would be faster and easier to do. Maybe somebody may have a illustration for you but by far a simple test light is all you need with a helper turning on the different lights as you check them out and writing all your findings down

The trailer wires are left turn, right turn, running lights(the smaller elements on both tail-lights and any side lights) and ground. Energise the corresponding lights and connect the wires accordingly. Find a good ground. A piercing test probe will find the correct wire for you if you can't track it to the bulb.

Hey Bryan

I've got them for Six and Four wire plugs

Six wire plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Recreational Vehicle: (color, use, plug mark)
White = Ground - GD
Yellow = Not used -
Brown = Right turn Brake - RT
Green = Tail and clearance lights -TM
Black = Battery, aux power - A
Red = Left turn/Brake - LT
Blue = Electric Brakes - S


Four wire plugs:
White = Ground
Yellow = Left turn/Brake
Green = Right turn Brake
Brown = Tail and clearance lights


Ground should be 10ga.
Others 14 ga

Best regards
Mike

• 4 way flat connector
• brwn-tail lights
• yellow-left turn
• green right turns
• white ground

1. 5 way connector
2. brwn tail light
3. yellow left
4. green right
5. white grnd
6. blue back up for surge brakes

i know of some more kinds but the 4 and 5 flat are the most used on trailers...word!

I take it the blinkers and brake lights work ok when not hooked up to the trailer? If yes, then the wiring to the tow hitch is not hooked up correctly. How many wires to trailer pig tail connection? U can have up to 7 depending on what you tow. Check to make sure these wires are hooked up from the truck to tow plug correctly: 7 wired---
brown-Rt turn and brake light, yellow-backup, white-ground, blue-electric brake, green-tail running lights, black-battery charger, red-left turn signal and brake light. Let me know if u have something other than 7 wire, I'll get the wiring color and source info for u.

exactly what does it do? please explain what happens when you press the brake turn on the light than brake signals ect.....