Troubleshooting Trailer Lights Strobing When Brake Pedal Pressed

Question:

Purchas3d the Curt 56420 for a 2024 Hyundai Santa Cruz. Not quite sure whats going on. Perhaps the unit is defective. Perhaps it is the wrong application. Plugged the connector into the factory tow package connector. Left and right signals work, the 4 way flashers work, parking lights work. When the brake pedal is depressed the trailer tail lights strobe. I plugged the trailer into my pickup and the tailights do not strobe. Any ideas?

asked by: Ken

Expert Reply:

Does your trailer have LED lights? This sounds like it could be hyperflashing from not enough power draw which would require installing load resistors # DI34ZR to fix the problem. Then again, it is only doing it with the brakes when I would expect it to be all of the functions. Double check the connection on the 4-way # CU94FR. Unplug it and plug it back in to make sure everything is properly seated.

You can also check out the 4-way on the trailer side. I understand it worked fine with your truck but it would still be a good idea to make sure your ground is secure and the 4-way doesn't have any corrosion or damage. If it still isn't working you might want to give Curt a call to see if they've run into this before and potentially send you a replacement under the warranty.

expert reply by: Robin H