How Does the Optronics Trailer Light # STL79RB Wire to Trailer Wiring

Question:

1. white, 2.. yellow/green and 3. brown 4. RED left Black right How do i wire the RED BLACK?

asked by: Rand C

Expert Reply:

The wiring of the Optronics Trailer Light # STL79RB that you listed are:

The white wire, with the mounting eye, is a ground wire that needs to be connected to the white wire of your trailer wiring.

The black wire would be connected to your running lights and is the lower intensity illumination. This should be run to the brown wire of your trailer wiring as this is usually the tail light circuit.

The red will be wired to the brake/turn wire and is for the higher intensity illumination. This will get run to either the yellow or green wire depending on which side of the trailer you are on. The green wire should be on the right side of the trailer and the yellow will be on the left side.

If this does not work the best recommendation I can give you would be to test the circuits on your trailer with a circuit tester like our part # 3808 to determine the functions of the wires on your trailer and wire them accordingly to the # STL79RB.

You may find that the extra wire you have on your trailer wiring is a reverse light.

I attached an FAQ article on trailer wiring for you to check out also.