wiring overhead fan into light - Fiberglass RV


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Old 06-30-2009, 11:22 AM   #1
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Name: Cyndi
Trailer: 1976 Boler 13 ft
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We tried and could not do it. Has anyone sucessfully wired a computer fan into the side light on the left side of cupboard? the fan works, it works wired right to the battery, and the light was on so the light was connected. We cannot figure out why it wont work. I have seen someone else do it, so why cant i? I am mounting the fan into the roof vent, wired into the side light but through an on/off switch. the concensus last night was just to wire it directly to the inside of the 12v outlet, which i thought was great but now i am having doubts. I worry that if it is wired that way it wont run on both shore power and battery, and only run on battery power. I am pretty sure that will happen but will test to be sure. Can anyone help with this? I need the fans. it is so hot in there during the day i cant go in there. thanks a lot
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Old 06-30-2009, 11:59 AM   #2
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Are you certain you had the polarity correct? The fixtures and wiring in our little trailers can be counter-intuitive.

-- Dan Meyer
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Old 06-30-2009, 12:19 PM   #3
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Name: Cyndi
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Are you certain you had the polarity correct? The fixtures and wiring in our little trailers can be counter-intuitive.

-- Dan Meyer
he said that he tried all combos. i will retry later today and see what happens
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Old 06-30-2009, 02:08 PM   #4
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Name: Larry H
Trailer: Trillium
Arizona
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Hi Cindi,

If the light works on shore and battery then the fan will, too.
The polarity of the fan really does not matter. The DC fan will turn in
either direction depending on the how it is hooked up. Customarily the
red lead to the computer fan is positive connection and black negative.

Here are three schematics to consider. Second one ok
but fan and light on together all the time. You could put a second
switch near the fan so you could use the light without it.

The third drawing is a little primitive but it is the Gucci way to
hook up the fan. The fan is independent of the light and can be
used for exhaust or intake. Probably more complicated than you need?

Good luck on your project. Larry H


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Old 06-30-2009, 02:42 PM   #5
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sounds like it's wired into the switch side of the light (negative side with a on/off switch in between)and hasn't used the positive side..... simple test just take a test light or multi tester and where the connection of the two wires goes to the fan see if you are getting 12 volts there?___(if yes you may have burnt out the fan and need to test it elsewhere) If not just take the two wires just outside the light and use them for your power source doing a test first..... this is just a hunch but may be your answer.
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Old 06-30-2009, 03:25 PM   #6
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Name: Cyndi
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Quote:
sounds like it's wired into the switch side of the light (negative side with a on/off switch in between)and hasn't used the positive side..... simple test just take a test light or multi tester and where the connection of the two wires goes to the fan see if you are getting 12 volts there?___(if yes you may have burnt out the fan and need to test it elsewhere) If not just take the two wires just outside the light and use them for your power source doing a test first..... this is just a hunch but may be your answer.
Joe
I cant really follow that drawing b/c it's all Greek to me. I will test it out this afternoon and report back. the fan does work and so does the light, just not wired together. the on/off toggle switch further complicates things for me. It will be done though, just a matter of how much head banging i have to do first.
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Old 06-30-2009, 07:35 PM   #7
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This sounds really similar to wiring a 3-way porch light, since there's multiple on/off switches. I'm certainly not an electrical engineer, but peterh has offered a wiring diagram (in color ) that I can follow and it may help you too Cyndi. Click here: 3-Way Porch Light
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Old 07-01-2009, 07:38 AM   #8
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In this case, a schematic is worth a thousand words and Larry's schematic says it all.

Look at it closer, there is just wire, switch, light and a fan in the drawing. His third option would be most useful.

Dean
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