Troubleshooting Installing Tow Bar Wiring On a Vehicle w/ Separate Brake Signal And Turn Signals
Updated 10/22/2025 | Published 09/25/2025
Products Featured in This Question
Question:
I installed the Demco 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles on a Ram 1500 Big Horn. All the lights work except when I press the brake on the RV the right passenger side turn signal does not work. The left driver side turn signal works when the brake is pressed. Thank you in advance for your assistance with this issue.
asked by: Michael N
Expert Reply:
Hey Michael, welcome back! Since your 2020 Ram 1500 has separate brake and turn signals you're also going to need the Vehicle to Vehicle Tail Light Converter item # 118158 and two extra diodes item # RM-792. The four diodes included with the Demco 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles item # DM9523010-54 aren't capable of separating those signals which is why you're getting those issues when you press the brakes.
What kind of motorhome do you have? You can add this information and any other questions you have where it says Reply to Jerred H and I'll be happy to answer them.
Product Page this Question was Asked From
Demco 4-Diode Universal Tail Light Wiring Kit for Towed Vehicles - 7-Way to 6-Way Adapter Cord
- Flat Tow Wiring Harness
- Splices into Vehicle Wiring
- Diode Kit
- Universal Fit
- 7 Blade to 6 Round
- Demco
more information >
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Jerred H.
10/22/2025
Hey Michael, did adding the tail light converter and extra diodes clear up the issue with your Ram’s right turn signal when braking from the RV? Knowing what fixed it could help others wiring similar setups.