The resistor has 2 terminals...you jumper from bat pos to one side and you should have LOW fan..you then jumper to the other side and you should have HIGH fan.
If YES, then fans are OK and R. is OK. If only High fan, but no low fan, then Resistor is open [ or burnt connections.]

If NO fans , then you have a bad wire in between R terminals and fan motors
or bad fans

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A Dalton