Which Wires Are Used When Installing Marker Lights On Trailer
Updated 07/16/2020 | Published 04/08/2015
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Question:
Hi, It is clear to me that there are 2 wires for left rear and two wires for right rear. My question is the marker side light wiring. There is only 1 wire coming from the marker, should I tap into the same light running to the rear right and left? same side for each respectively? If so, which wire should I tapninto for the markers? Thanks!!
asked by: Anton N
Helpful Expert Reply:
For a typical trailer wiring you will have a brown and green wire for the right-hand side of the trailer and brown and yellow wire for the left side.
If this is a new wiring installation and you are installing wiring like part # A35W42B, the brown wire that runs down each side of the trailer is for the marker lights and taillights. The yellow and green wires are for the left and right turn signals. You will want to tap into the brown wire for the marker lights.
If you are adding marker lights to an existing system, you can use a circuit tester like part # PTW2993 to test the wires for function when it is connected to a vehicle or a 12V power source like a battery.
I have attached a helpful article that explains trailer wiring and what the typical functions are.
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35 Ft 4-Way Trailer Wiring Harness - Wishbone Style - 42" Ground
- Trailer Wiring
- Trailer Connectors
- Trailer End Connector
- 4 Flat
- Plug and Lead
- Optronics
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Bill A.
7/12/2020
I have 2 wire side marker lights. Both wire are same color . How do yiu know which is which?