Troubleshooting Trailer Lights Flickering
Updated 09/29/2025 | Published 09/06/2025
Question:
I recently bought a trailer hitch and wiring for my 21 audi sq5. I installed the hitch and wiring and the trailer wiring flickers on and off. Even when the vehicle is off. All the lights work as they should but i get the flickering. Wondering if i got bad wiring or what is going on. Ive installed a ton of hitch and wirings and have never experienced this before.
asked by: Lucas L
Expert Reply:
Hey Lucas, welcome back. I recommend checking your ground wires on both the item # 119250KIT harness you purchased and the trailer's. You could also have something causing interference so check the clamps to. You may have another wire too close.
Does your Audi have incandescent lights and does your trailer have LED lights? If so you'll want to install the Putco LED Light Bulb Load-Resistors item # P230004A-2.
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Jerred H.
9/29/2025
Hey Lucas, did you have a chance to check the ground wires and clamps on both your Audi and trailer? I'm curious to know if that helped resolve the flickering issue, as it could help others experiencing similar problems.