How to Wire 3 Wire Trailer Tail Lights

Question

Question:

Accidentally, forgot to unplug lites. Trailer has red,blk,and white wires. Dont know what order the red,blk and white wires go back on six colored wiring harness. red on red and blk on blk didnt work. theres blk,brn,blue,red,green,and white. tried white on white blk onblk and red on red alredy, puzzled

asked by: john g

0

Expert Reply:

To determine the correct wiring for your trailer you will need to use a circuit tester, item # PTW2993, and attach the wires from the connector by function only. The light wires should be as follows, red is the stop turn wire and the black is the running light wire, the white wire is the ground wire and should be connected to a suitable ground on the trailer frame. The easiest way to get it right is to connect the taillight wire, usually brown from the 6-Way connector (see link) to the black wire on the light temporarily and look at the brightness of the light. Then connect the brown wire to the red wire and check the brightness of the light. The brighter connection should be connected to the green (right) or yellow (left) stop/turn circuit, and the dimmer light wire should be connected to the brown running light circuit.

The black wire from the trailer connector is usually 12-volt power and the blue wire is for trailer brakes. The white wire from the trailer should be grounded to a suitable ground on the trailer frame.

expert reply by: Robert G

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Answer 1

It sounds like your current lights with 2 wires ground to the trailer by the mounting hardware. The One LED RV Passenger Tail Light #RVSTL0060 has three wires, the white wire is the ground, the black wire is the taillight and the green wire is for…

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Answer 2

There is an LED taillight option that is 8-1/2" x 4" that should be a similar dimension to the taillights on your Keystone Montana (though please measure yours to verify) and have all the functions sans the backup lights (there isn't a…

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Answer 3

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. You can verify this by testing the wires using a circuit tester such as…

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Answer 4

If your trailer has separate turn signals from the brake lights and you want them to remain that way, you will need to use a special converter. On the trailer side, behind the 7-Way, you will attach the Vehicle to Vehicle Taillight Converter,…

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Answer 5

A flat 4-pole trailer harness carries three lighting circuits, brake lights, running lights and turn signals. The green wire carries right side turn and brake signals; the yellow wire carries left side turn and brake lights; and the brown wire on the…

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Answer 6

You will first want to check the fuses on your tow vehicle. Some vehicles could have fuses for operating the turn signals and brake lights of a towing package. You will want to check if they are installed and working properly. The next thing is to…

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Answer 7

If I understand you correct you have a trailer with separate turn signals and brake lights that aren't functioning properly because you 2013 Ford F-150's trailer wiring combines those signals on one circuit. If I'm wrong let me know. If…

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Answer 8

A trailer light with 3 wires, like #RVSTL0060, that are black, white, and green generally the black wire is for running lights, green is for stop and turn signal, and white is for ground. If the old light on your trailer only used 2 wires, then it…

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Answer 9

You can certainly add a 7-way trailer connector to your trailer with 6 wires. You would simply have 1 pin on the 7-way connector that did not function. I recommend adding a 7-way molded trailer wire connector like part #H20046, and a junction box…

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Answer 10

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 11

Since your trailer uses a combined wiring system where the stop and turn signals run on the same circuit, in order to add a third brake light to your trailer you would need to use a 2-Wire to 3-Wire Converter, like part #118158. This will convert the…

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Answer 12

That's a very good question, we tend to be extra cautious and say to use 10 gauge wire because that would be more than enough. When you get into longer trailers that will end up using a lot of wire the heavier gauge wire becomes more necessary.…

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How to Wire 3 Wire Trailer Tail Lights

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