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Parts Needed To Install A Trailer Tail Light That Has 4 Wires  

Published 10/13/2021



Question:

My fiance bought led utility trailer lights and they came with no wiring directions. Each light has 4 wires coming from it. I have attached photos. I need to know which wiring harness to buy for them and which color wires would match up to those on the harness. I was used to trailer lights having only 2 wires. ??There are no side marker lights on the trailer. Please let me know what is the best avenue for this set-up.

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Expert Reply:

I am unable find any lights like these that have the 4 wires for attaching to the light. You should be able to test each of the wires for their function using a 12 volt battery and connecting the wires directly to the terminals. My only concern is that your lights were set up to have separate brake light functions and that is why you have 4 wires. If that is the case and you want the lights to function properly you will have to run additional wiring and components as opposed to just using a traditional 4-Way Trailer Wiring Harness # A25W2GWB.

We do offer the Optronics Combination LED Trailer Tail Light # STL9RGB and # STL8RGB that do have the 2 wire connections that you are more used to seeing. One wire for the turn signal/brake light and one wire for the running lights. The ground connection is tied to the mounting studs on the lights.

To use the lights that you already have, if they do have a separate brake lights you will need to use a 3rd Brake Light Logic Module # PP20-702 that ties into the wiring in the front of the 4-way. Then you will need to run a dedicated Wire # DW02359-1 to each of the brake light connectors on your tail light.

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Bud M
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