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There are 2 wires that lead to the fan, run the negative to the battery and the other to the switch. Then either run a power wire from the battery or if you want it controled by the key go to the hot wire on the acc. plug to the switch, hope this helps.
 

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The temperature sensor already has 12v ..Thats why the fan will work by grounding the temperature sensor wire ..To install a fan switch just "T" the sensor wire to ground thru the switch ..

That sensor wire is a ground wire for the fan your looking for trouble putting 12v thru the ground side of the ECM
 
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