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Many aux fans will come with a wiring harness that has a variety of options built in. Some kits come with thermo switches, relay switches, manual switches, the works.
Honestly, get a decent kit and it will probably have anything you could need, and instructions on how to wire it to do what you want. A $100 kit is big enough to replace your entire engine fan probably, so as an aux fan you could go half that or less.
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Mike Bradshaw
1980 911SC sunroof coupe, silver/black
Putting the sick back into sycophant!
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