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Well I am 2 for 2 on having free stuff. I measured the resistance of the fan and came up with 1.0 ohm between 2 of the wires. The controller I have is rated for 16 amps so that should work fine. The third wire is still a mystery as it had around 150 ohms to both other wires. Only thing I can figure is it was some kind of return signal to the ecm or a controller. Maybe returning fan speed and it would adjust voltage up or down to the fan. At any rate I'm just going to leave that wire unattached.
Took a quick glance at the engine bay and was a little surprised to find no fuse box under the hood. Guess I will have to run a ignition power wire from inside unless I find something else under hood. My rough measurement of the inside of the shroud is 21-22 inches so with a little trimming I think I can mate the electric fan to the existing shroud.
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