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 Fan in the Head		  New Topic  Topic Locked
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Initially Posted - 06/25/2006 :  14:56:19  Show Profile
To help cool things off, I installed a [url="http://www.hella.com/produktion/HellaPortal/WebSite/Internet_usa/ProductsServices/Electronics_Accessories/Fans/Jet_Fan/Jet_Fan.jsp"]white Hella Fan[/url] in the head today. I mounted it to the wooden bulkhead in the back corner, pulled power from the overhead dome light. This is the third one of these little fans I've installed in the boat. They work pretty cool and don't draw much power. Nice to have a little air movement in the head.
1997 250 TR WK (sold)
1984 O'Day 28 (sold)
1979 SISU 22
Bath, NC.
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AADIVER
Admiral

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USA
966 Posts
Response Posted - 06/25/2006 :  19:16:15  Show Profile  Visit AADIVER's Homepage
"...pulled power from the overhead dome light."
How, exactly, did you do that? Any pics to guide an electrical Luddite like meself?
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 06/25/2006 :  20:10:16  Show Profile
I removed the plate that the dome light is attached to, drilled a 1/4" hole in the plate. Ran the fan wires through the hole and spliced the fan wires to the light wires. Positive to positive, negative to negative. Replaced the plate, then mounted the fan in about the same place as the suction cup hook that is under the VHF in the picture below.
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 06/25/2006 :  20:43:55  Show Profile  Visit britinusa's Homepage
They are great little fans Tom.
Frank, if you install one... absolutely check that the wires are marked +ve. & -ve. Connecting them the wrong way around will blow them apart... literally!
(we found out because our cigar lighter plug was wired incorrectly and I tested the fans by plugging them into it!.. BANG!)

Paul
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AADIVER
Admiral

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USA
966 Posts
Response Posted - 06/25/2006 :  23:24:15  Show Profile  Visit AADIVER's Homepage
Uh, I think I'll get a local marine electrician to do the wiring if I decide on fans. I did manage to install the superbrite festoon LED's without blowing any fuses. My cabin now has a warm amber glow.
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JohnMD
Navigator

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207 Posts
Response Posted - 06/26/2006 :  12:41:23  Show Profile
You're absolutely correct about the polarity being critical when wiring the fans. It's easy to check with a cheap volt meter. The fans wires are clearly marked with positive and negative. I also wired a variable resistor in series with the fans I installed. Since they don't come with a speed control, it's an easy and cheap way to regulate the speed (and noise).
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Tom Potter
Master Marine Consultant

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USA
1913 Posts
Response Posted - 06/26/2006 :  13:20:22  Show Profile
John
Do have any info on the variable resistor? There are times when I would love to slow these babys down.
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JohnMD
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207 Posts
Response Posted - 06/26/2006 :  14:22:19  Show Profile
I'll check the ohms and get back to you. I got them at Radio Shack. You could even use a small, cheap, fixed value resistor if you didn't need to have a variable fan speed. My fans are installed next to the center lights, so, I wired the rheostat in and put them behind the lights. I haven't had to change the fan speed, but, It's pretty easy if I need to.
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JohnMD
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207 Posts
Response Posted - 06/26/2006 :  21:16:34  Show Profile
I checked and I have 58 ohms in series with my fans. Get somewhere near there and you should be close. You can even get a bunch of fixed resistors and put them together to get different values. They're pretty cheap.
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Tom Potter
Master Marine Consultant

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1913 Posts
Response Posted - 06/26/2006 :  21:26:44  Show Profile
Thanks John.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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