Troubleshooting A Non-Working Curt Trailer Wiring Harness On A 2012 Jeep Liberty
Updated 01/06/2026 | Published 09/17/2024
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Question:
I put in a kit for my 2012 jeep Liberty got everything wired up still not working to my boat trailer my truck works fine not sure what I’m missing here
asked by: Charles H
Expert Reply:
Hey Charles,
You'll want to pick up a circuit tester # PTW2993 or multimeter # PT89ZR and check the 4-pole trailer connector on the Curt T-Connector Vehicle Wiring Harness # C56334 and see if any of your light signals are coming through. If not, you'll want to then check the wire harness's ground and power wires. On the power wire you'll need to check the fuse holder to see if it's blown.
From there you can also test the signal wires from the lights to see if the signal is running up to the converter box. If you have power and the signals are coming to the converter box but not going out through the 4-pole wire then the converter box is bad and the wire harness would need to be swapped out.
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- Powered Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Hidden
- CURT
more information >
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Robin H.
1/5/2026
Hey Charles, did testing the Curt wiring harness with the circuit tester or multimeter help you track down the issue with your trailer lights? Knowing what you found could help others troubleshooting the same problem.