Troubleshooting Brake Lights Not Working on Trailer with 2003 Jeep Liberty

Question:

i bought the kit just for the 4 prong plug to hook to my jeep liberty....it says to hook the green wire to my turn signal wire on one side and the yellow wire to the other side turn signal....brown wire to running light and white to ground.... ............when i do that i have no brake lights on the uhaul rental trailer...i have jeep brake lights but no trailer brake lights...all the others work on the trailerrunning/turn signals...what am i doing wrong?

asked by: Tom

Expert Reply:

I am not quite sure what wiring kit you used to install a 4-Way connector on your 2003 Jeep Liberty but it sounds like it may not have come with a converter. Your Jeep Liberty has a separate wiring system, which means the brake and turn signals are sent along separate wires. A harness with a converter is needed to combine these circuits so that they work with standard trailer wiring.

For example the Curt T-Connector Vehicle Wiring Harness # C55382, which is custom-fit for your 2003 Jeep Liberty, includes the required tail light converter to ensure that the Liberty's wiring matches that of the trailer. This is a plug-in harness that simply connects to factory ports located behind the driver and passenger side tail lights.

If you can tell me what wiring harness you installed on your vehicle I will be happy to confirm if this is the issue or offer some additional troubleshooting tips if it is not.

expert reply by: Chris R