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Old 08-13-2023, 01:51 PM   #1
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Exclamation Loss of power to bathroom fan wire after new decking

Hello all, my first post here.

My wife and I had to redo the roof of our 2007 Sunny Brook, 30'. We replaced all the decking with new, put a new membrane on, and replaced the trim. This weekend I have had the time to put on the roof accessories. I had just installed the new bathroom vent (with fan.) After sealing the vent, I went inside to wire up the fan. I used a reference photo of the old fan wiring to attach the new one properly. The fan would not turn on. I tried with the old vent and fan, still no power.
I have an analog multimeter and after researching how to use it to check for power, the 2 wires showed no activity. The light in the bathroom works, though. To make sure the multimeter worked, I pulled down the bathroom light and checked those wires; success there, I got a reading.
So it seems that the wires leading to the fan are now dead. We did some rough drawing on the roof to make sure that we didn't secure the decking with screws that would puncture the wiring harnesses that run through out the roof.
So my dilemma is thus; I can't take the roof off to fix a couple wires. Are they safe to leave? Should I splice some wires from the bathroom light to the fan as I know that set of wires are live?
Any information of what I am doing right or wrong would be greatly appreciated.
Thank you.
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Old 08-13-2023, 05:08 PM   #2
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Unlikely but possible you damaged wires, especially if they were not exposed when the membrane was removed - and all your screws went in straight and into structure (joists/trusses).

Do you have a coach (not chassis) wiring diagram, and have you checked all the coach 12vdc fuses?

Also unlikely you would have penetrated and severed both wires if a screw did miss structure - you can attempt to see which wire was possibly severed by finding a source of 12vdc and ground (your light fixture) and connect your meter to first one lead at the light fixture (say, the 12vdc + wire), the other at the fan location, to either wire and note if you get a 12 volt reading to either at the fan location.
If you get 12vdc to either wire - then you will know you have a good ground at the fan - and you’ll know your hooked to the +12vdc wire at the light fixture.
Then - switch your meter lead at the light fixture (which will be the ground side of the light fixture), and measure for 12vdc on the other wire at the fan.

If you don’t get readings as indicated - you have either a blown fuse (most likely) or a severed wire.
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Old 08-13-2023, 05:52 PM   #3
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Humm - not sure what time do either. I guess I would think what I could have messed up. I would double check the work and take the fan back down to test it.
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Old 08-16-2023, 11:25 AM   #4
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You would not be the first to put in a new appliance only to find it or its switch was defective. The easiest way will be pull the fan out and test it from a known 12v source. Test both the 12v supply and ground, And then you will know. Good Luck DR
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