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Old 05-07-2018, 03:12 PM   #5
MARKDTN
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Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,260
Re: Does anyone make a 3-relay fan controller?

You might be able to do this with a Volvo relay. It is used to control a 2-speed fan. You could wire low speed to 1 fan and high speed to both (but you would have to add a big diode on the one that was used twice). Just Google "Volvo fan relay" and you can find wiring diagrams.
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