PAC-2750 fan controller & Trinary switch

[2014sierraAT]

Hey fellas, I have an old air ac kit in my truck along with 2 spal electric fans. The fans are controlled by a Dakota Digital pac-2750 module. I’m trying to understand how to correctly add a trinary switch to this system. The Dakota controller has an input labeled A/C with the description “AC clutch power sense (+)”. The trinary has 2 blue and 2 black wires. Has anyone ran this setup that can explain to me which of these wires need to go where? The only installation instructions I’ve been able to locate aren’t including a standalone fan controller. I contacted Dakota Digital and couldn’t completely understand their instructions. I will post the reply from DD and hopefully someone here can understand better than I could.


“The A/C terminal is activated by 12VDC. Whichever wire you have that provides a 12VDC signal whenever your AC is enabled will work.
In most cases we go off of the signal that goes to the A/C compressor clutch. That signal is usually 12VDC.”