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Thread: Question about wiring fans

  1. #1
    Registered Member Devryn's Avatar
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    Question about wiring fans

    I'm getting ready to wire the two Mishimoto fans bought and I purchased a Ron Francis relay kit for it (AR79). I wanted to control the on/off with the temp wire on my FiTech. This Ron Francis kit doesn't have a reference to a temp sensor wire in the instructions...Can I wire the temp on/off wire to the grounds on the relay to control the on/off?

  2. #2
    Registered Member Old Buzzard's Avatar
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    What is the intended function of the Fitech temp wire?
    There should be a fan control output in the Fitech. Is it a ground or a 12V?
    I suspect it could be either. In any case, it'll be a low power circuit, designed to operate ONLY the relay control side.
    Do NOT hook it up otherwise, until we get the circuits id'd.
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  3. #3
    Registered Member Devryn's Avatar
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    FWIW, and for future searchers, I was correct. When wiring fans with a FiTech fuel injection system, the relay's ground wire goes to the yellow temp wire on the FiTech. I called FiTech and Ron Francis and they had agreed before I finished the wiring.20210811_162629.jpg

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