Troubleshooting Trailer Lights Not Working with Curt T-Connector Harness Installed on Ram ProMaster


On my 2018 ram 1500 promaster i received my tow vehicle trailer adpter hardness from your company i followed all the instructions all the signals break lights and tail lights were working now only one light on the trailer is working i hooked the trailer to another van and all of the lights are working fine except on my 2018 ram promaster need help with this problem i havent checked the fuse yet to the adpter i bought from your company adpter part number c56209 thanks


Expert Reply:

Since all of the trailer lights worked fine when using a different vehicle, it does seem like you have narrowed down the issue to the wiring on your 2018 Ram ProMaster 1500.

To further verify this I do still recommend testing the 4-Way connector on the vehicle with a circuit tester like # PTW2993. Test the pins on the connector while you have a buddy activate the signals in the van. If you aren't getting power to all the pins then I recommend testing the wires both before the converter box for the Curt Harness # C56209 and the wiring after the converter box.

If you get appropriate power on the wires leading up to the box but no power on the wires after the box, then the converter has gone bad and the harness will need to be replaced. The Curt harness does have a 1-year warranty.

If you are aren't able to locate the source of the issue please let me know and we can continue to troubleshoot.

expert reply by:
Chris R

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