Does All Trailer Wiring Use the Correct Colors
Updated 12/08/2025 | Published 11/24/2025
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Question:
I have RV wire that said the green is for running lights and brown is for right turn and my marker light that I want to hookup has black and we’re do I hook the marker light to.
asked by: Richar S
Expert Reply:
Hey Richard, so not every trailer wiring setup uses the industry wire colors unfortunately so in those cases you need to wire by function instead. So if your RV has green for running lights that is what you need to match that circuit to on your marker light that is black. You can use a circuit tester like part # PTW2992 to determine the functions of the wires if you aren't sure what does what.
Product Page this Question was Asked From
LED Trailer Clearance or Side Marker Light w/ Reflex Reflector- 3 Diodes - White Base - Amber Lens
- Trailer Lights
- Clearance Lights
- Rear Clearance
- Side Marker
- Rectangle
- Surface Mount
- Non-Submersible Lights
- LED Light
- 4L x 2W Inch
- Amber
- Optronics
more information >
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Jameson C.
12/8/2025
Hey Richard, how did things go wiring your marker light to the running light circuit on your RV? Your update could make it easier for others sorting out mixed wire colors on their trailers.