foxbodybill89
Active Member
The fans are wired together through two different relays in parallel. Both fans are wired directly to one relay and wired to a separate relay through the factory resistor to give the low speed. The controller is a microprocessor that just sends ground signals to switch between the two relays to either send power directly to the fans or through the resistor to the fans based on temp data. There is a separate wire from the A/C compressor wire to a terminal on the controller box, the controller senses the compressor turn on and switches the high speed relay on.
In the trinary switch diagram that karthief gave, if you wire it up with a relay exactly the same way but substitute the controller trigger wire for the fan on the purple wire from pin 87 I think it will do what you want.
In the trinary switch diagram that karthief gave, if you wire it up with a relay exactly the same way but substitute the controller trigger wire for the fan on the purple wire from pin 87 I think it will do what you want.
Last edited: