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Old 04-04-2010   #15
4g63tcrazy
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Join Date: Oct 2007
Location: Stillwater
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Re: Wiring my fans. I'm a n00b

Quote:
Originally Posted by Pushit2.0 View Post
The only thing in the diagram I see is I would have switch power from the relay going to the fans, not switched ground. They will work either way. The thermal switch does not have a positive/negative, when it gets above the set temp it completes the circuit between the terminals. And in this case it would complete the ground circuit on the trigger side of the relay to complete the ground circuit of the fans so they turn on. Also if you want one fan to be a pusher and the other fan to be a puller you will have to have the polarity switched going into the fans, so if your wires are blue and black coming out of the fans you will have a blue and black from each fan be positive and the other blue/black wires as ground. Also with the relay you would have 30 as your main fused power from the battery, then 87 out would go to the fans, and 87a is not used. Then have 85 as your switched power 12v, not straight from the battery, and have 86 go threw the thermal switch to complete your circuit to ground, you could use any good chassis ground to avoid extra wire length.

~John
Instead of switching the polarity I was just gonna take the fan blades off and flip it around. But either way would work..

Quote:
Originally Posted by blackrosenova400 View Post
You would add a switch to bridge the thermostatic switch. I added arrows pointing to the wires to use.

How exactly would I use a switch to bridge the thermo switch? I understand now that when it gets to a certain temp the thermo switch connects the circuit. So with the switch I would need to be able to flip it on and connect it. Do I need a 2 pronge switch? 3 pronge?

I feel like I'm not understanding the most simple concept and it's throwing me for a loop..
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