Troubleshooting No Running Lights Power for 2009 Dodge Sprinter Trailer Wiring
Updated 01/05/2026 | Published 09/10/2024
Question:
Hello, I have a 2009 Dodge Sprinter built into a 2010 Four Winds Ventura RV. My trailer running lights stopped working. Now using a test light blinker works but running light pin does not. The trailer has LED lights but they worked in the past. Could not find any bad fuses under the dash or seat. Any ideas?
asked by: Todd M
Expert Reply:
Hey Todd,
Since you've checked your fuses but you aren't seeing power at your 2009 Dodge Sprinter wiring connector, it means that the wiring somewhere between your fuses and that connector is damaged. You'll either need to trace it yourself and find where it's damaged to replace it, have a shop do that for you, or install your own 4-Way with the T-One # 118381.
Product Page this Question was Asked From
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Vehicle End Connector
- No Converter
- No Tow Package
- 4 Flat
- Plug and Lead
- Plug-In
- Visible
- Tekonsha
more information >
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Robin H.
1/5/2026
Hey Todd, how did things turn out with the wiring on your Sprinter and the trailer running lights? Did tracing the line or adding the new 4-way harness get them working again? Your update could make it easier for others facing the same issue.