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Re: PAC-2750 fan controller & Trinary switch
After some more research it appears that the normal wiring for a trinary switch is the black wires are for the compress controls and the blue wiring is for the fan controls. Using a fan controller like you have will require a departure from the drawing in the link I sent. I will try to make time tomorrow to sketch up something for you.
This link helps confirm the trinary switch wiring, but not with your fan controller.
https://www.vintageair.com/universit...rinary-switch/
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Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. 
RIP Bob Parks.
1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo
If it breaks I didn't want it in the first place
The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377
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