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How to Wire LED Replacement Trailer Lights

Question:

I am replacing my old bulb type trailer lights with LEDs. Noticed that the LEDs have 3 wires each but I have a 4 wire system to match my truck. What is the wiring pattern or do I need a converter? Each LED is two positive and one negative wire.

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Expert Reply:

If you are looking at and LED Trailer Tail Light like part # STL8RB, then you will not need a converter to make it compatible with the 4-Way Wiring Harness on your truck.

You will need to figure out the wiring on your trailer to make sure that you get all of the wiring done correctly. You can use a Circuit Tester # I26 for that purpose. All you have to do is hook up your new LED lights using the following information.

Brown is for tail lights
Green is for stop and turn
White is for ground

The 2 extra wires on the tail lights are white and they are used for the ground.

expert reply by:
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Jon G

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Follow up Questions

John G.

I am trying to convert my motorhome tail lights to LED. When I connect the wires White to ground, red to break/turn, and black to running light, the running lights do not come on. If I disconnect the break/turn light lead the running light comes on. I am replacing 4 lights and they all act the same. I am baffled and I would appreciate any help from you on this.

Etrailer Expert
Reply from Chris R.

First make sure that the white ground wire is securely attached to a clean, bare portion of metal on the trailer. If there is any paint or debris on the surface, sand it down completely, and then reattach the ground. When just one or another function doesn't work on a light - it almost always comes down to a weak ground connection. Please let me know if this doesn't resolve the issue and we'll go from there!

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