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Old 05-13-2021, 12:53 PM   #1
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Class A lost trailer light function. Winnebago

Hello all. I have a 2011 Winnebago 35’ Adventurer (w) with V10 / Ford chassis. Somewhere along the way between central NC and central Florida I lost voltage to my portable lights attached to the tow. Have running lights but no turn/brake. Coach lights function properly.
Have searched for related fuse, can’t find it. Got underneath and opened up wiring wraps in search of an open circuit. Only has 9500 miles on rv and wiring looks like new, although there is a separate maze of wiring that splits off to the tow plug.
Any ideas, please?
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Old 05-13-2021, 02:14 PM   #2
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That's a tough one...
Ford is notorious for headlight switch failures, which can show up in all manner of different ways... I have had running light outages and rear tail light outages with the headlights working fine...
That said, however, usually the trailer plug harness is a tap off the main brake/ turn harness. And, in order to compensate for a heaver load on the turn signal blinker maker thingy (from the extra trailer bulbs) the MH maker puts a relay in the line with separate power to the relay...
So, this put in a relay runs of the break/ turn voltage, but with a separate power supply

If you have no power to the trailer lights, I would locate the relays (and the power wire & fuse for them, for the malfunction).

Good Luck.
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Old 05-13-2021, 05:04 PM   #3
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Have you checked for voltage on the pins of the plug that your lights connect to the RV? You could use a voltmeter or one of the automotive light type devices.
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Old 05-13-2021, 07:14 PM   #4
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Roadhogger-

2011 Ford F-53 owner's manual is here. Page 66 and following says the trailer turn/stop signals are fed from fuse #22 on the Passenger Compartment Fuse Panel.

Winnebago Wiring Diagrams for 2011 Adventurer 35P are here. Front End Wiring Installation (link here), sheet 2, Zone C-4, Detail BA says the Ford passenger Compartment Fuse Panel is mounted above the Winnebago circuit breaker panel that is in front of the driver's left shin.

Operator's manual for your coach is here. Page 3-15 in the manual (which is page 39 of the Adobe PDF document) has pictures of the Winnebago circuit breaker panel that is by the driver's left shin.
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Old 05-17-2021, 12:38 PM   #5
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The schematics were a great help. I found the 20a blown fuse under a panel within a fuse/relay panel. Problem rectified. Thanks very much.
Have a great week.
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Old 05-17-2021, 12:43 PM   #6
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Found blown 20 a fuse in a covered panel within a fuse/relay panel.
Thanks for assistance. Have a great day and smooth travels.
Robert Land
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