Electric fans with PSI harness

[clemsonteg]

Originally Posted by elf w/capital T

Put it like that and yes, it does make sense, I'm always deterred with the symbols n what not. Thank you for taking the time to spell it out!

No problem. If you find that the trinary switch supplies a ground signal instead of 12v, all you need to do is carry that to the fan relay without the need for a third relay. I'm assuming that since my binary switch is 12v, that the trinary switch is similar with the exception that the third post only activates at a certain pressure. I'm planning to have my second fan switch on when the AC is on.