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Vent fan only works when door open
#761572 May 29th 2020 12:56 pm
Joined: May 2020
Posts: 1
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BDon Offline OP
stranger
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Posts: 1
Hi all,
I’ve had my 83 B250 camper van for about a year and can quite seem to figure this out. My cabin lights and vent fan only seem to turn on when I have the door slightly ajar. No matter if I’m on the main battery, switched to the leisure, or connected to shore power. The previous owner had added a stereo and messed with the wiring up front, but apart from that I have no idea where to try and find the disconnect. It obviously receives power, if the switch associated with the door is triggered (or untriggered) as it may be.
HELP!!

Re: Vent fan only works when door open
BDon #761573 May 29th 2020 1:50 pm
Joined: Feb 2013
Posts: 201
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enthusiast
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Welcome to the site BDon.

Sounds like your door switch is faulty, IMO.

Re: Vent fan only works when door open
SeattleVanDude #761585 May 29th 2020 4:45 pm
Joined: Dec 2001
Posts: 3,280
pooh-bah
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pooh-bah
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Sounds like the fan is wired to the light which is made to work on the door switch.


Orange 1973 Dodge Shorty B-100

Life should not be a journey to the grave with the intention of arriving safely in a well preserve body,
but rather to skid in broadside in a cloud of smoke, thoroughly used up,
totally worn out, and proclaiming

"Wow What a Ride"

Johnny O
"O Vanners" of Connecticut! Since 1982

Re: Vent fan only works when door open
BDon #761603 May 29th 2020 8:31 pm
Joined: Sep 2005
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Likes: 9
carpal tunnel
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carpal tunnel
Joined: Sep 2005
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It's most likely a misplaced ground wire. The door switches provide a ground (-) for the factory interior lights. Sounds like someone mistook that door switch wiring for a good spot to tap the vent fan and cabin lights onto. You'll need to trace and find a better, solid ground connection. Sounds like, from what you say, that the "hot" or power side is okay.


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