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Old 09-21-2017, 09:49 AM   #1
1 Rivet Member
Santa Rosa , California
Join Date: Jun 2017
Posts: 16
Cabin Lights Suddenly Off

I have a 2015 Flying Cloud 23FB and the lights in the cabin suddenly went out. I checked and all the other electricals on that circuit are working fine and the main fuse remains intact. I took out the switch (kind with one switch and dimmer) and found its fuse had blown. I replaced the fuse and it blew again. I replaced the switch with a new one ($80!) and the fuse still blew. Again, the circuit (#2) that these cabin lights are on is not blown and everything else on the circuit is working fine. Can a bad LED light cause the switch fuse to blow?


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Old 09-21-2017, 10:09 AM   #2
Half a Rivet Short
2017 30' Classic
Carlisle , Pennsylvania
Join Date: May 2017
Posts: 5,154

A light can fail as a short. It's rare but it can happen. More likely, you have a loose wire and it's touching the chassis. The lights are run is a daisy chain with the connections behind the fixtures. The basic drill is to pull all the bulbs, check the fuse. If it's still toast, start pulling the fixtures and disconnecting them. As you pull them, you might also find a cracked fixture that shorts to the chassis .... who knows ....


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Old 09-21-2017, 10:56 AM   #3
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Santa Rosa , California
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Posts: 16
Thanks, I will pursue this troubleshooting strategy. The reason I didn't think it was the wiring shorting to the chassis is because I had been using the lights in prep for a trip and they just went out with the trailer sitting perfectly still - like something blew. I suppose it could be that just walking in the trailer caused and already exposed frayed wire to short, but I considered one of the lights or fixtures to be more likely... thanks again!
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Old 09-21-2017, 11:41 AM   #4
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1991 34' Excella
Princeton , New Jersey
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Was the trailer plugged in when this happened or just on batteries? If just on batteries they may have been low and the current in the circuit went up to the point of blowing the fuse.

If the voltage is normal the above testing is the way to go.
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles

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Old 09-21-2017, 03:14 PM   #5
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Santa Rosa , California
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Thanks! I was plugged in at the time, so no issues with voltage levels...
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Old 09-21-2017, 03:48 PM   #6
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2014 20' Flying Cloud
Long Island , New York
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FYI this recent thread may have some overlapping issues IMO:

Good luck,

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Old 09-22-2017, 09:16 AM   #7
2 Rivet Member
2014 27' FB International
Sugar Land , Texas
Join Date: Apr 2016
Posts: 49
I'm very interested in this because the ceiling light (LED) on my 2014 27FB did the same thing but replacing the fuse caused the light to come back on. Based on your experience I would say it's more than just the fuse. so I' m expecting the fuse to blow again. Keep us posed on what you find.
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Old 09-22-2017, 06:59 PM   #8
"Space A" S/O Registry 11
2006 34' Classic S/O
Fort Worth , Texas
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Posts: 714
It sounds to me that there is an open between the DC bus and the switch. Test the fuse ends for power then when you have power jump the switch and check to see if there is power to the light fixture(s).

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