Troubleshooting Lighting Issues On A 2023 Ford F-150 Flat Tow Wiring Setup

Question:

I had my new 2023 Ford F-150 set up to tow behind our RV. I believe it was early November 2023. All was working well until I started having issues when I turned on the headlights in the coach. When the headlights are switched on, the taillights on the Ford F-150 start fluttering. When I use a turn signal, both sides blink lightly, and in the actual taillight area, the independent blinker lights do not activate. I need to determine the cause so I can make the repairs needed. Ive tried switching the light hookup from the coach to the F-150, and it works the same way. Thank you, Don

asked by: Don G

Expert Reply:

Hello Don. I just went over all of this with our installers. Why this problem started all of a sudden is a little odd, because it sounds like everything was working fine at first. The fact that both lights are fluttering indicates a ground issue. Seeing as you are using the Roadmaster Smart Diode Klit # RO44FR, I suggest that you pull the tail lights out and check the ground wires coming off of the diodes. Make sure that they are grounded firmly to good clean metal free of any paint, rust or corrosion. I suspect that you may find a loose or corroded ground connection, so please start by checking this.

Feel free to post your findings in the comments below and I am happy to further assist if needed.

expert reply by: Jesse M