Correct Flat Tow Wiring Harness Didoes for 2022 Ford F-150

Question:

I used a 4 diode tow bar wiring set to connect my 2022 F-150 that has two double filament blubs in each tail light. Now when connected to RV only the lower blub operates from the RV. Both the upper and lower light up tail /stop/ and turn from the truck system. Any suggestion on how to get both bulbs to operate will be greatly appreciated.

asked by: Larry S

Helpful Expert Reply:

The 2022 Ford F-150 (Non-Hybrid) requires special diodes for the flat-tow wiring harness. If you're not using these special diodes then you could run into issues like you described. The correct ones for this vehicle are the Roadmaster Universal Wiring Kit with Smart Diodes; part # RO44FR for vehicles with LEDs or part # RO94FR for vehicles with incandescent.

If you are using smart diodes already please let me know and I would be glad to see if I can assist further another way.

expert reply by: Conner L