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You don't need a "relay setup " Just get a fog lamp relay from Autozone they cost about $5. The wire you have powering your fan now would go to the coil side of the relay ( 85)fused. You will also need a ground for the coil side of the relay ( 86 ). You could use the wire from your stock type temp switch for ground. Then run a wire from your battery to the relay ( 30 )fused. then run a wire from the relay to your fan ( 87 ) fused and that's it. The termial numbers are marked near the post on the bottom of the relay and it also tells you what terminal is what on the side of the relay. The relay should take less than 1 amp from your keyed circuit and will pull the power directly from the battery. The fans will also turn off when the key is turned off.

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