4 Pole Trailer Connector Wire Color Code
Question:
My plug has 4 wires red brown green and yellow Iwhich one is the ground wire
asked by: Robert
0
Expert Reply:
Is this for the connector on the trailer or the vehicle?
If it's on the vehicle, use a circuit tester like # PTW2993 on each wire as a helper activates the taillight functions. The yellow is typically left turn/brake lamp, the green is usually right turn/brake lamp, and the brown usually carries the running lamp circuit. Ground the tester to the vehicle and have your helper turn on each taillight function one at a time as you test each wire. Chances are the red wire is the ground.
If you're talking about the connector on the trailer itself, look for the main trailer ground on the trailer tongue and see which color wire is grounded. You can use a car battery to apply 12V to the other three wires to confirm their function by seeing which taillight circuit is activated when power is applied.
expert reply by: Mike L
0
Products Referenced in This Question
Product Page this Question was Asked From
- Trailer Wiring
- Wiring Adapters
- Single-Function Adapter
- 4 Flat
- Plug and Lead
- 6 Round
- Tow Ready
more information >
Featured Help Information
Miscellaneous Media
Similar Expert Q&A Pages
- Wiring for Five Trailer Wires to 4-pin Connector on Tow Vehicle
- Recommendations For Adding LED Marker Lights To A 20 Foot Cargo Mate Trailer
- Should Adapter 4 Pole to 6 Pole, # 30637 Have Constant 12 Volt Power Even With the Key Off
- How Do Wires of Adapter 4 Pole to 6 Pole # 30637 Attach to Vehicle
- Installing 4-Way Flat Connector on Trailer with 3 Wires
- How Does Non-Wishbone Style Trailer Connector Wire to Trailer that Had Wishbone 4-Way
- Adapter to Connect 4-Way on Vehicle to 6-Way Round on Trailer
- Trailer Connector has 4 Pins But 5 Wires
- How to Identify Functions for Each Wire on a Trailer
- Wiring Up a Harbor Freight 4-Way Trailer Connector and Trailer Lights
- No Right Stop/Turn Lights On Small Box Utility Trailer With Running Lights On
- 4-Way Trailer Connector that has 5 Wires
- Replacement 5-Way Recommendation to Replace a 5-Way that Had 7-Wires Run to It
- 6 Prong Square on Jayco Trailer to 4 Prong Flat Wiring Color Scheme
- How to Attach a Toad with a 4-Way to a Motorhome with a 7-Way
- Recommended Trailer Hitch, 4-Way, and 6-Way Wiring for 2018 Toyota Sienna
- 4-Way Connector Needed to Replace 4-Way on Trailer with 6 Wires
- Trailer Wiring Has 5-Wires White, Yellow, Green, Yellow/Brown, and Green/Brown
- How Does Trailer Running Light Circuits with Yellow/Brown and Green/Brown Wires Run to New 4-Way
- Why Does my 4-Way Connector Have 2 Wires Ran to One Prong for the Tail Light Circuit
- Recommended 4-Way Trailer Wiring with 5 Wires
- How To Hook Up Trailer with Two Brown Wires to Vehicle with One Brown Wire
- Adapting a 6-Way Square Jayco Trailer Connector to 7-Way on Vehicle
- Troubleshooting Pop-Up Camper Trailer Running Lights
- Are 8 Side Marker Lights on a Trailer Too Much Power Draw
- Replacing a 4-Way Connector on Trailer with 7 Wires
- No Running Lights On Trailer with Two Brown Wires (Wishbone Trailer Wiring Harness)
- Wiring Replacement Trailer Side 5-Pole Wishbone Harness