Installing Side Marker Clearance Lights with Two Wires on Trailer

Updated 07/06/2020 | Published 07/02/2020

Products Featured in This Question

16 Gauge, 4 Conductor Bonded Parallel Wire - Per Foot

(237)

$2.82

LED Trailer Clearance or Side Marker Light with Reflex Reflector - 2 Diodes - Amber Lens

(901)

$24.50

Question:

How do I wire them in on the new wiring harness. I have everything working but side markers. Side marker led lights on trailer with yellow and gray wires only.

asked by: Jason R

Expert Reply:

The Bonded 4 Wire - per foot # 16-4B-1 you asked from would use the brown running light wire for your clearance/marker lights. The LED light you referenced sound like they have two wires so one will be power and the other ground. You can connect them to a battery to test which wire is power as LED lights are polarity sensitive. It is likely the yellow is power and the grey is ground which will be attached to the base frame or metal frame structure on your trailer. Often the clearance/side marker lights only have the power wire because they are grounded through the mounting hardware, but it sounds like you have a separate ground wire like # 328-K-51. I've attached a video of this light to assist.

expert reply by: Jason S