Need help wiring 12v dashboard fan into storm shelter

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Old 07-28-16, 08:46 AM
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Need help wiring 12v dashboard fan into storm shelter

Ok, I have some experience with 12v wiring...I added some lights and a horn to my small tractor, etc. I am having trouble in this case though. Here's the situation...I have an in ground tornado shelter and have mounted a 12v maradyne car/truck dashboard fan to improve air circulation. The shelter has a 120v outlet. This fan only has 1 wire. I bought a 120v to 12v transformer on eBay. The output of this transformer has 2 wires. How do I wire this up??
 
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Old 07-28-16, 08:50 AM
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To clarify...this is what I bought thinking it could convert 120v to 12v..IntocircuitŪ 30W Waterproof LED Power Supply Driver Transformer 120V to 12V. It was only $15 on eBay. The output is 2.5 amps and the high speed on the fan is 2.7 amps, so I figured it's ok.
 
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Old 07-28-16, 09:20 AM
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Welcome to the forums.

Probably not going to work. That's called an LED driver for a reason.
A motor is a completely different type of load. You can try it.

The wire coming out of the fan is positive and the metal frame of the fan is ground.
 
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Old 07-28-16, 09:31 AM
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Ok, so do I just tap a screw into the metal base of the fan and put the black wire from the transformer to that?
 
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Old 07-28-16, 09:33 AM
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That should work.

If you're going to mount the fan to something..... the mounting screws would work too.
 
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Old 07-28-16, 09:34 AM
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The output says 2.5amps and 30watts. Are there other parameters in play than the numbers when considering LED vs. a small fan motor? Why wouldn't it work, if the output parameters make sense?
 
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Old 07-28-16, 12:24 PM
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Does your transformer convert AC to DC? Your fan likely needs DC and not all transformers also concert AC to DC.
 
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Old 07-28-16, 10:50 PM
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Trying it is the only way to know for sure.

LED's are a limited load. A DC motor can be like a dead short to a power supply on startup.
 
 

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