Troubleshooting Curt T-Connector # C56403 With Power Always On Green Wire/Right Trailer Light
Question:
Hey guys, I just installed my eco hitch, and all went flawlessly. I have installed my Curt wiring controller in my 2018 VW Tiguan, and I have power to the green wire all of the time. No flashing, when turn signal is activated. This is all tested using a test light. What should I check next?
asked by: Frederick D
Expert Reply:
First you will want to use your Test Light # PTW2993 to test for power going into the Curt T-Connector # C56403 on your 2018 Volkswagen Tiguan. This will allow you to determine if the module is somehow getting a signal or if the module itself is defective. If you do not have power on the green wire going into the module but have power on the green wire coming out of the module you know the module is defective.
If the green wire does have power you will want to check the connectors to ensure none of the pins inside that portion of the harness got bent and are creating a short inside the connector.
Please let me know if these all check out or what you find by testing the wiring going into the Curt module.

Products Referenced in This Question
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Powered Converter
- Custom Fit
- 4 Flat
- CURT
more information >
Product Page this Question was Asked From
Featured Help Information
Instructions
Continue Researching
- Shop: Trailer Hitch
- Shop: Trailer Wiring
- Shop: EcoHitch Hidden Trailer Hitch Receiver - Custom Fit - Class III - 2"
- Shop: Valterra Gray Water Drain Connector - 1-1/2" FPT to 3/4" Hose Thread
- Shop: Replacement 4-in-1 Elbow Adapter for SewerSolution Macerator System
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: EcoHitch Hidden Trailer Hitch Receiver - Custom Fit - 2"
- Article: Trailer Wiring Diagrams
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Article: Routing the Power Wire for a Trailer Wiring Harness
- Shop: Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Video: Curt T-Connector Vehicle Wiring Harness Installation - 2021 Volkswagen Tiguan
- Q&A: Is The Curt 4-Way # C56403 Better Or Worse Than The Tekonsha 4-Way # 118811 On a 2022 VW Tiguan?
- Q&A: What Should the Voltage Output Be at the 4-Way Plug on Curt T-Connector Wiring Harness # 56016
- Q&A: Trailer Lights Not Working with a CURT Trailer Wiring Harness on a 1996 Nissan Pathfinder
- Q&A: Both Blinkers on With Wiring Harness 118811
- Q&A: How to Test a 4-Way Trailer Wiring Harness Plug
- Q&A: Troubleshooting Running Light Circuit on Trailer
- Video: Curt T-Connector Vehicle Wiring Harness Installation - 2018 Volkswagen Tiguan
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Search Results: trailer hitch
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Video: Finding the Right Trailer Wiring Harness
- Search Results: trailer wiring
- Video: Curt T-Connector Vehicle Wiring Harness Review C56040
- Shop: Brake Controller
- Search Results: hitch
- Video: Curt Powered Tail Light Converter Installation - 2023 Kia Telluride
- Article: My Trailer Hitch Doesn't Fit