trailer running lights
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Joined: Oct 2020
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trailer running lights
all my lights work on my trailer with exception of running lights. did an electrical check at the truck side 7 pin and no power to running lights. Checked and replaced fuse 99 which was not blown but changed anyway. Not sure where to go next? 2017 6.7 Super duty lariat
Mountain Pass
Joined: Nov 2019
Posts: 157
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Get under the truck and pull the connection behind the 7-way plug. There is a common issue (might even have a TSB) with water intrusion there causing corrosion. Check for corrosion, clean it off, and replace the connector with plenty of electrical grease to help prevent it in the future.
Fleet Mechanic
Joined: May 2018
Posts: 1,765
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Well... this thread is timely. I just got back home from a trip and noticed the running lights weren't working. Brakes, brake lights and directions worked fine but the running lights don't. I just ordered a 7-pin tester to confirm if it's the truck side or the trailer side. It sounds like I'm a couple days behind you with my findings.
Edit: Mine was caused by a blown fuse #99. Replaced the fuse and all is well. Hopefully you figure out what happened to yours!
Edit: Mine was caused by a blown fuse #99. Replaced the fuse and all is well. Hopefully you figure out what happened to yours!
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