Troubleshooting Hyperflashing After Installing a 3-to-2 Wire Taillight Converter
Updated 11/02/2026 | Published 10/17/2026
Question:
Hi, I have a 2003 Chevy Silverado 3500 that I’m installing a flatbed on. The original tail light wiring has separate circuits for the brake lights and turn signals, so I purchased a Curt 56130 tail light converter to connect the factory wiring to the new tail lights, which use a combined brake and turn signal circuit. I have everything wired up, and everything works great until I press the brake pedal while the turn signal is on. At that point, the turn signal starts hyperflashing. As soon as I release the brake pedal, everything returns to normal. I’ve regrounded all the rear tail lights and even tried separating the grounds, but the issue is still there. I’m starting to wonder if the Curt 56130 converter is compatible with my truck or if something else is causing the problem. Any help or suggestions would be greatly appreciated. I’m at a loss trying to figure this out. Thanks!
asked by: Ronnie C
Expert Reply:
Hi Ronnie; the Curt 56130 is the correct type of converter for combining your Silverado's separate brake and turn signal circuits.
I'm guessing your new flatbed has LED tail lights. If that's the case, the hyperflashing is likely caused by the lower electrical load from the LEDs.
I recommend adding load resistors like # DI34ZR to the left and right turn signal circuits on the vehicle side of the converter. These simulate the load of incandescent bulbs so your truck's flasher operates normally.
Are the tail lights on your flatbed LED or incandescent?
Product Page this Question was Asked From
Load Resistor Kit for LED Turn Signals - 50 Watts - 6 Ohm - Qty 2
- Accessories and Parts
- Trailer Lights
- Load-Resistor Kit
- Diamond
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Ronnie C.
10/20/2026
The flat bed taillights are incandescent but the headache rack part of the flat bed are LED. so half incandescent and half LED. I ordered the load resistors to try, I will let you know if it solves the problem. Thanks Ronnie