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Old 05-18-2022, 07:58 AM   #1
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I have a 2006 Ford e450 chassis with a 2007 Winnebago Access class C 30’ motor home on it. I have no power to trailer light plug. No running, brake, turn signal, or back up lights. I was thinking one fuse but can’t seem to locate any. I checked the fuses under the hood and under the dash with a test light and they all seem to be good. I haven’t been underneath yet to check wiring due to weather. Anyone have any idea where Winnebago may have installed another fuse. I don’t see any in the storage compartments either.
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Old 05-18-2022, 08:08 AM   #2
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With no power to any pin in the connector , there would be at least 3 fuses involved . Turn , brake and running lights are all fused separately in the chassis .You have to get under the RV and followed the wiring ; from the trailer plug ;back to the frame .

Your problem sounds like the wiring got snagged and disconnected somewhere .
Did the trailer plug ever work ?
Or is this RV new to you ?
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Old 05-18-2022, 09:15 AM   #3
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There should be a splice where the Ford chassis frame ends and wbgo adds the extention un tape the splice and inspect for corrosion.
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Old 05-18-2022, 09:17 AM   #4
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Also remove the 7 pin trailer connector take it apart and inspect all connections, there are prone for internal corrosion if not sealed properly.
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Old 05-18-2022, 10:21 AM   #5
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New to me. And I did see this morning the three fuses you’re talking about. I checked them with test light and all tested good. That’s why I’m thinking a common fuse btwn there and plug. I haven’t done anything except check fuses. Harness was next thought but I was hoping someone with more experience could lead me down the right path. Thnx.
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Old 05-18-2022, 10:22 AM   #6
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Thnx. I’ll start at wiring behind plug and work back to source. Never thought about bad plug.
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Old 05-20-2022, 07:22 AM   #7
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Originally Posted by avfordguy View Post
There should be a splice where the Ford chassis frame ends and Winnebago adds the extension un-tape the splice and inspect for corrosion.
I believe this is not true. I do NOT recommend unwrapping the wire harness.

I believe the motorhome prep package from Ford includes a Ford connector with extra long pigtails to extend the trailer wiring. Being of "Ford" quality, I highly doubt the connection has failed. But if you suspect a failure there, follow the wire harness to the connector which would be somewhere in the area of the rear axle.

There is a possibility that the wire harness got damaged if the wheelbase was adjusted, so keep inspecting forward if your wheel base is not one of the three stock versions, 138", 158" and 176".

The trailer wiring fuses and relays will be supported through the two Ford fuse panels, one under the hood, the other by the driver. The RV manufacture should not have tampered with those circuits. Your Ford owners manual will identify which fuses and relays support the trailer wiring.

I could be mixed up between the trailer wiring and the tail-light wiring, so keep this in-mind. I would start by identifying the assignment of every fuse in both fuse panels, via your owners manual. If there are supporting trailer wiring fuses, then what I said would be validated.

A favorite location for RV installed in-line fuses, is behind the kick panel by the parking brake pedal. So keep this in-mind as well.
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