I had a single electric fan on my truck which wasn't enough to cool it but I think thats cause i got seperate problems. what I did though was I bought the sensor which I installed in the top of the radiator per the manufacturers instructions. I ran a wire straight off the battery to a toggle switch inside the cab so I could turn it off and on. From there the controlled juice wire went to the relay which was controlled by the sensor. I liked it like that because I could shut the fan off if i wanted to after shutting the truck off so I wouldn't possibly kill my battery.
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