Troubleshooting Demco Diode Tow Bar Wiring Kit Not Working Installed on Wrangler
Updated 05/18/2026 | Published 05/15/2026
Products Featured in This Question
Question:
I have the Demco tow light set up on my 2018 Jeep wrangler. The right blinker quit working on my jeep. The 7 pin at the Moho tested good. Left blinker and the rest seem to be working. Do you have a suggestion on what to check next? Blinker does work when not connected to Moho.
asked by: Jeff R
Expert Reply:
Hey Jeff, its either the wiring to the Demco Tow Bar Lighting Kit part # DM9523010-54 or it's the diodes. I would take the rear taillight area apart and use a circuit tester like the part # PTW2993 to test for voltage to the diodes when the right blinker is on. If voltage is making it to the diode but not getting past it the issue is the diode. If you need a replacement diode you could use the part # RM-790.
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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Jeff R.
5/18/2026
Thank you. Turns out it was a simple fix. The wires from the 7 pin to the tow bar 6 pin had a break where they had been repaired. Was able to use a butt to butt splicer and all is working now.