Troubleshooting Curt Trailer Wiring Harness With No Power
Updated 10/21/2026 | Published 10/19/2026
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Question:
I’ve got no function. I’m very adept at installs and followed the trailer vid. Fuses are in the correct spots in the fuse box. It’s grounded and the plug ‘clicked’ and is secure to the cars pre-installed factory wiring. What else can I check?
asked by: Mike V
Expert Reply:
Hi Mike; I would start by double-checking the ground connection on the Curt Wiring Harness # C48ZV. Make sure it's securely attached to a clean, bare metal surface. I would also unplug the factory connector and plug it back in to make sure everything is seated properly.
If that doesn't help, use a circuit tester like # PTW2993 to check for power going into and coming out of the converter box. If there's no power going in, the problem is on the vehicle side. If you have power going in but nothing coming out, the converter is likely defective and the harness will need to be replaced.
Are you getting no power at all from the 4-way, or are only certain lighting functions not working?
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
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on Custom Fit Vehicle Wiring
Ken
10/21/2026
Assuming all fuses are good and, in places required. My Pilot came with a towing receiver and didn't have the fuses needed with it. If you have a voltmeter with a continuity setting: Set your multimeter to the continuity mode, usually indicated by a diode symbol or a sound wave icon, to test if a circuit is complete. Touch one probe on the place you connected the ground wire from the trailer harness and the other probe where you know 100% is metal connected to the metal car body/frame. If your meter doesn't move, you connected to a part that is not grounded to the vehicle.