How To Wire a Trailer Clearance and or Marker Light On a Trailer
Updated 07/06/2026 | Published 03/11/2023
Question:
My marker lights have black and yellow wires and appear to need a positive and negative run they light up when connected to a 9v battery. How do I wire these into the flat 4 wire harness on my camper? Black to brown, yellow to turn signal wire?
asked by: Robert L
Expert Reply:
I can't speak for all trailer clearance and or marker lights but most like the LED Trailer Clearance or Side Marker Light with Reflex Reflector part # 328-K-51 feature a simple two wire install, one for power and one for ground. If you aren't sure which wire has which function you can test them pretty easily with a battery or reach out to the light manufacturer. The above for example has a white wire for ground and a yellow wire for power. The ground wire will need to be attached to a bare metal surface and the power wire will need to be attached to the running light circuit on the trailer, usually brown. The lights are not tied into the stop/turn signal circuits.
I have attached a help article below which goes over the basic wiring for trailer lights.
Product Page this Question was Asked From
LED Trailer Clearance or Side Marker Light with Reflex Reflector - 2 Diodes - Amber Lens
- Trailer Lights
- Clearance Lights
- Marker
- Oval
- Surface Mount
- Non-Submersible Lights
- LED Light
- 4L x 1-1/2W Inch
- Amber
- Command Electronics
more information >
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on Trailer Lights
Ron
7/6/2026
Want to replace marker light on right rear of travel trailer. One on there now has two black wires one going to green wire the other one going to white wire. New light has one black wire. How would I wire this up. Thanks