Troubleshooting Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit RM26FR Not Working On Tail Lights

Question:

how do you trouble shoot if the lights fail to work?

asked by: Edward A

Expert Reply:

I see you are looking at the Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit # RM26FR and first I just want to ensure your 2023 Ford Bronco or other vehicle you are using these on does have the Variable Voltage Incandescent Tail Lights the diodes are designed to be used on. Then you will want to verify you are getting power to both the RV Brake and RV tail going into the diodes using a Test Light # PTW2993. If you are not getting power you will need to check the wiring coming from your RV to determine the issue. If you have power going into the diode and nothing coming out I recommend verifying you have the correct wire tapped into on the brake light. You will be able to test this wire with the test light as well. If no signal from your Bronco or other vehicle you are wired then you may have damaged a fuse or connected to the wrong wire. Finally if you are getting good power on the incoming and nothing on the tail light then you likely have a ground wire issue. You will want to check the ground wire connections to the vehicle and ensure they are not diminished by a thick paint or undercoating which would prevent a good connection. If everything checks out then there must be something wrong with the diodes and they would need to be replaced.

expert reply by: Bud M