that is a 2 speed fan. It needs to be wired through relays. The high speed draws somewhere ahound 40 amps and the low speed somewhere around 16. (don't quote me on the exact #'s)but this is close. I am running this setup on my '72 I only have the high speed hooked up right now. It is activated by a temp switch in the thermostat housing. I do ,however have a wiring schematic somewhere around here as soon as I find it I can try to email it to you. Possibly even post it here