Ok, I've been searching like a MF'er!!
I'm using a Blackbear harness, single pin. I soldered a pin on the ac trigger wire and as I understand it, you can connect it in the PCM, one to 33 and one to 42.
My tuner has all of the settings right, in fact today we put 30 seconds delay on startup and for once they didn't run...until 30 seconds was up

We can't figure out why the fans run when the engine is ice cold. Any help is appreciated...it's drivin me nuts!!
It's in my '00 GMC
Also, at first the wire that's on 33 now, was connected to the ac trigger wire and they always ran.

 

You have a single pin harness and you're connecting it to two pins. Duh. I am not familiar with their harness, but in a single pin setup you use pin 42 and the A/C clutch. You are doing something wrong. You know the A/C clutch signal is positive (+), right?

 

Sorry, I've read so much **** the past few days. I thought I read that you could do that.

 

Come on guy's, enlighten me

 

What wire are you calling the A/C trigger wire? Can you post a diagram of their harness? If not, can you post instructions? If not, the labels that were on the wires?

 

Well, no,no and no.

I didn't install the harness. The wire that was connected to the ac wire is the one I'm calling the trigger wire.

I can't find a diagram of their harness.

I don't have any instructions or labels.


I'm going to take the truck to a friend that can fix this harness to work with pins 33 and 42 or make a new harness if needed.

I appreciate you trying to help.

 

If you're turning a single pin into a two pin harness, here's a good read: https://www.performancetrucks.net/fo...d.php?t=432250

IIRC, I think you have to flip 2 wires from one of the relays to go from single pin to two pin, but it's been a long time since I messed with efans.

 

Thanks, I sent that link to my friend that actually understands those things.
Seems like the more I look at that stuff the more I here Charlie Browns teacher...Blah blah wah wah blah