Wiring Marker Light onto Trailer

Question:

I pulled the old marker light out and am replacing it with an LED marker light the same size... my question is, does it matter which wire from the trailer goes on which post on the light..? one white wire, one brown/white wire - neither post on the light is marked with anything unlike the tail lights that had G, STP, Turn etc... ??

asked by: Rob

Expert Reply:

Marker lights do have polarity, but when you use the correct pigtail for the lamp it'll be evident which wire is which. For example, the # MC57RB marker light you referred to uses a # A46PB pigtail. The pigtail will only insert into the back of the lamp one way, the black wire is for power and the white wire grounds to the trailer.

I'll link you to our trailer wiring help article, which contains all kinds of diagrams and helpful information.

expert reply by: Mike L