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Old 08-22-2012, 04:28 PM
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If I were you I'd install a relay...... Connect a 10 gauge wire to the starter lug or the battery (good strong 12v source) into a fuse (same amperage as the fan motor) into one side of the relay, other side of the relay to the pos side of the fan motor lead..... you can attach the gorund side of the motor to any good ground...... then use your on off switch to control the relay coil. I'd also advise you use a temp controller to automaticlly control the fans etc.....

I attached a simple dia.... it only one fans but two could be attached easily.... if you put in the temp controller it would be where the switched 12v line is etc....
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