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I doubt you would want to purchase the fan assembly from the dealer $$$$ and a parts store will sell just the replacement motor. Buy the junk yard version and buy a replacement motor if you have issues.
I ran 2 relays with diodes to control my Lincoln Mark 8 donor fan assem. The battery feed does need to be a AWG #10 in and out of the relays. A ground wire from the fan motor housing to a chassis ground should also be a #10 wire. Control or signal wiring
to /from relay and switch or sensors do not need to be that large because the handle a small amp load.
I suggest you use sensors to ground the relay-s and install a 3 way switch to select fan speed and manually turn the fans on. I use 2 different temp sensors to turn fan on low and then high if temp reaches second sensor. It is all ignition B+ enabled but also can over-ride the sensor trip points and turn the fan to low with a dash mounted switch.
Make sure you pick up battery B+ direct and not after it enters your main fuse block wiring . I use either the battery lug on the starter or from the battery lug on the alternator. Jeff C
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