How to Wire 3 Wire Trailer Tail Lights
Updated 02/03/2010 | Published 02/01/2010
Question:
Accidentally, forgot to unplug lites. Trailer has red,blk,and white wires. Dont know what order the red,blk and white wires go back on six colored wiring harness. red on red and blk on blk didnt work. theres blk,brn,blue,red,green,and white. tried white on white blk onblk and red on red alredy, puzzled
asked by: john g
Expert Reply:
To determine the correct wiring for your trailer you will need to use a circuit tester, item # PTW2993, and attach the wires from the connector by function only. The light wires should be as follows, red is the stop turn wire and the black is the running light wire, the white wire is the ground wire and should be connected to a suitable ground on the trailer frame. The easiest way to get it right is to connect the taillight wire, usually brown from the 6-Way connector (see link) to the black wire on the light temporarily and look at the brightness of the light. Then connect the brown wire to the red wire and check the brightness of the light. The brighter connection should be connected to the green (right) or yellow (left) stop/turn circuit, and the dimmer light wire should be connected to the brown running light circuit.
The black wire from the trailer connector is usually 12-volt power and the blue wire is for trailer brakes. The white wire from the trailer should be grounded to a suitable ground on the trailer frame.
Product Page this Question was Asked From
Featured Help Information
Miscellaneous Media
Continue Researching
- Shop: Vehicle Lights
- Article: Trailer Wiring Diagrams
- Video: Detailed Breakdown of the Optronics Trailer Clearance or Side Marker Light w/ Reflector
- Video: Breaking Down the LED Clearance or Side Marker Trailer Light w/ Reflector
- Search Results: mc32ab
- Q&A: Why Do Some Trailer Tail Lights have 3 Wires and Some have 2 Wires
- Shop: TecNiq Dome Surface Mount Light - 4.5" - Round White LEDs - With Switch
- Shop: TecNiq PCP2 Side Marker Light - Self Ground - Amber
- Q&A: How to Install a Three Wire Trailer Light
- Q&A: Recommended 4 inch by 2 inch Clearance Light for Trailer
- Q&A: Proper Mounting Location for Side Marker Lights on a Trailer
- Shop: Optronics LED Trailer Tail Light - Stop, Turn, Tail - Submersible - 10 Diode - Oval - Clear Lens
- Video: Complete Breakdown of the Optronics Fleet LED Trailer Tail Lights w/ Grommets
- Shop: Optronics Fleet LED Trailer Tail Lights w/ Grommets - Stop,Turn,Tail - Submersible - Oval - Qty 2
- Shop: Optronics Trailer Clearance or Side Marker Light w/ Reflector - Incandescent - Black Base - Red Lens
- Shop: Optronics LED Trailer Clearance and Side Marker Light w/ Reflex Reflector - 6 Diodes - Amber Lens
- Shop: Optronics LED Trailer Clearance and Side Marker Light w/ Reflex Reflector - 6 Diodes - Amber Lens
- Shop: Base Plate for Tow Bar
- Shop: Vehicle Tow Bar Wiring
- Video: Complete Breakdown of the 3rd Brake Light Logic Module
- Search Results: trailer lights
- Shop: Vehicle Tow Bar Brake System
- Video: Review of the Blue Ox 6-Pole, Round Pin, Trailer Wiring Socket
- Video: How to Install: Roadmaster Universal Hy-Power Diode Wiring Kit on your 2022 Ram 1500
- Search Results: flat tow wiring harness
- Search Results: rm 732
- Search Results: etrailer?gad source1
- Search Results: diode kit flat tow wiring harness
- Search Results: 6 wire wiring
- Article: Wiring Trailer Lights with a 4-Way Plug (It's Easier Than You Think)
on Automotive Tools
