e-fan harness
 

It's cold, and I'm bored and want to do something to my truck.

I have a 99 with an 02 pcm in it. I have called bb, about their 2 pin efan harness, and they said it wouldn't work in my truck. I have hptuners, and there are options to turn on fans, and control them. Can I re-wire my nelson harness to control the efans with the pcm, and actually control them, or do I need them hooked to the ac wire.

Ive got a write up on how to do the harness.
If i knew exactly how your harness was setup i could walk you thru how to repin it.

I'm pretty sure I've seen your write up a year or 2 ago, but forgot who did it ,and couldn't find it yesterday. I will search again now that I know it was you.

This is one i just did recently.

https://www.performancetrucks.net/fo...-101-a-494123/

Lemme know if you need some help sorting it out

On OBS trucks, can the PCM be used to activate the fans when the AC is on? Is that what pin 33 is for? I have the one fan tapped into the AC clutch signal right now (Nelson harness).

I cant rem about the OBS pcms.. but i rem seeing something in there about fan options

Hows the 14 bolt coming along Brent?

If you have a harness set up to tap into the AC clutch wire you have to change the polarity on the relay signal to hook it to the PCM.

#GM 14-9.5
I ordered one of these covers from blownchevy, and picked up the u-joint last week, and I've got new rotors in the garage. A couple of my buddies are itching to work on something since it's been cold, so it's going in soon.

I understand the diagrams, but the only one I can find is the one that hooks to the ac. I know I have seen one that has 2 connections to the pcm instead.