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You could go straight to the battery for a power source, or be a little neater and pull power from the little junction block of red wires right behind the battery. Any autoparts store or Radio shack sells little in-line fuse holders. Get one rated 15 A. Get a generic 12 V relay from the auto parts store. You would connect 12V from your fuseholder to one main terminal on the relay; a wire from this to the + of the fan motor, and a wire from - on the fan motor, to the chassis (ground). Then connect a wire to + on the relay coil (small terminals) from any source that goes on with the key- any of a dozen places on the fuse block are fine, this takes less than 1 A. Connect the - from the relay coil to either a switch on the dash, or (much better IMO) a thermo-switch as found in all new radiators. If your radiator has been replaced, it likely has a thermoswitch or at least a threaded hole for one, built right in. Connect a wire from the other pin of the switch to ground, and you're done.
Good luck!
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Rob Bareiss, New London CT ::: 86 244DL, 87 244DL, 88 744GLE, 91 244: 808K total
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