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Old 12-30-2013, 08:49 PM   #1
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Location: Calhoun, Georgia
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Angry 5th Wheel Running Lights PROBLEM

I just purchased a used Cyclone 3950 toy hauler, and I noticed the running lights kept blowing my #38 fuse on my 2003 Ford F-350 Dually. I tracked down a lose wire <brown wire - running lights> fixed it and now they work...UNTIL I put the truck into reverse and then THAT blows the #38 fuse in the truck under the steering wheel...Any suggestions???

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Old 12-30-2013, 10:10 PM   #2
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Ford has had an issue with the wiring harness somewhere between the front of the truck and the trailer plug. On my 2002 F350, I had to abandon the wire in the harness and wire the trailer clearance lights into the tail light circuit on the truck. Never had anymore issues.

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Old 01-01-2014, 11:55 AM   #3
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Does your toy hauler have back up lights? If no, then check to ensure the power wire for that is not shorted where it terminates in the junction box near the hitch on the trailer.

If you have back up lights, you are just going to have to troubleshoot further. Bad socket, bad bulb, etc.

Good luck.
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Old 01-02-2014, 08:01 AM   #4
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Thanks! I'll give it a check. I had a loose wire below the junction box, but I'll check the box tomorrow and see if I can find something else loose.
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5th wheel, lights

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