[Lippyp]

I'd also put a relay in the circuit to each fan, that way you aren't putting a huge current through your thermostat/switch or trying to thread heavy guage wires through your bulkhead.

The single electric fan in my truck (from something Japanese!) was fitted by the previous owner and was wired without a relay. One day I put my hand up behind the dashboard switch (no thermostatic controller yet) in traffic and found that the switch contacts were too hot to touch due to the huge current drawn by the fan going through the switch. Also when turned off the fan would windmill in the ram air coming in the grille and act as a dynamo and light the switch up...weird!

I think Wes has posted a wiring diagram up here before, I'd jsut do a search on electric fan and see what threads you get.