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You don't want to wire the fan direct to the battery. First, you'll need crazy heavy wires and a heavy duty switch. The foglight switch could never handle it. Second, it would run when the car was off, and you could easily leave it on and kill the battery.
A better idea is to wire the switch to the fan relay. Find the fan relays under the hood. Run a wire from the coil ground to your switch. The coil wires will be thinner. Turn on the ignition and check for voltage at the thin wires with the relay unplugged. The one with no voltage is the ground. Now the switch will activate the realy. If you use tap splice connectors, the whole thing will also be un-doable with practically no impact on the car. That's always a virtue. Any of the stock switches can handle this.
If you have a two speed fan, you will have two fan relays. I have been told that the low speed helps provide some of the current to run the fan at high speed. So you will want to activate both. If you activate just the high speed you could blow a fuse.
However, a better idea is something that you don't have to remember to turn on. That means either the stock fan switch or an electronic one. If you were going to rely on a switch, you might consider setting the fan to always run on low speed and leave the switch for high speed. The fan will probably still last forever-- though you may, at least in theory, wear out thermostats faster. I've done the switch thing before, and you only have to forget once to turn it on and you'll have a real problem.
There are a lot of fan switches that will fit the 9000 and you can get them in 82°, which will turn the fan on sooner. There are also a lot of electronic controllers. The link below is one designed specifically for the 9000, so it's super-easy to install.
posted by 130.91.5...
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