The Optronics Trailer Light, # ST9RB, Is Not Working On Trailer Lights With Separate Ground Wire

Published 10/11/2010

Question:

bought product in Phoenix to take to remote area can not get lights to function old lights had 3 wires: left brown +brown/yellow and right brown +brown/green white ground wire is connected to trailer neck bolt and connector on vehicle 05 Toyota 4-Runner. My closest service center is 80 miles round trip. Can you advise? Thank you.

asked by: Richard J

Expert Reply:

The Optronics Trailer Light, # ST9RB is a stud mount light that is grounded through the mounting studs. The lights on your trailer are using a separate ground wire. You will have to run a ground wire to the stud to be able to ground the light.

I have the Optronics Trailer Light, # STL9RB. This is a same size light with the same features, but has LED lights instead of the incandescent lights. It is not grounded through the studs so it has the three wires ( brown, yellow, and white) like the wires that are on your old lights. The yellow wire is stop/turn, the brown wire is the taillights, and the white is the ground.

I am sending some video links on how to wire trailer lights and troubleshooting the ground wire.

expert reply by: Jeff D