Quote:
Originally Posted by First c10
Does anyone have a wiring diagram for this 3 relay setup and adding a trinary switch to control the fans when the AC is on?
I got my AC up and running but need the fans to come on when in traffic or parked. Since the low/high speed as wired above is how mine is wired and works great just wondering the best way to wire the trinary switch into the mix?
thanks
Scott
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I'll see if I can dig up a wiring diagram for you, but it's probably going to be tomorrow. The way I prefer to do what you're asking is tie the trinary switch into the hi speed fan control wire through a pair of 47 ohm 1/2 watt resistors in parallel. The resistors are needed to keep the PCM from throwing codes about fan control circuit faults. You can also use diodes, but the wiring is a bit easier with the resistors. Some will suggest adding additonal relays which will work, but they're bulky, expensive and not necessary in this situation.