I have a pcm of nc electric fan harness with the 3 relays. The issue is it’s from a trailblazer ss. I’d like to use this harness on my 01 Sierra. Would I just need to remove the ss fan connector and crimp on a terminal to the green wire for the pcm?

 

Green wire needs to come out of plug and goes directly to the PCM.

The fan connection plugs likely also need to be changed to whatever fans you will be using.

 

on their website it shows an option for 99-02 harness and it has a different setup than the rest.
i professionally circled the different style for 99-02 with Microsoft paint lmao

 

The eyelet is a ground and the wire is black. There is an additional light blue wire to tie into the AC signal on the 99-02

The Blue trigger goes to pin 33 on Red connector. Their maybe a dark green wire in this slot. It can be removed and tied back into the harness.
The Green trigger goes to pin 42 on blue connector

If in doubt call them and see if the one you have can be made to work.

Other wise buy the correct one for a plug and play set up.

 

whats the eyelet ground for? arent both the green and blue wires switched grounds? they plug into the pcm but they just act as ground signals dont they?

 

I do not know. I did not build or design there part. I have only used there wire harness kits in the past.

IMO, I believe they are superior to any other harness kit currently on the market. I have not personally had a failure and so far I have not heard of any one else with their newer style harness have a failure.

I just happen to have a few Brand New Fan harness kits so I copied the instructions for the sub harness.

 

Hi Revrentzero, the main harness is the same, the subharness is different. There is a little circuit board in there and the pins go to different places than they do on the TBSS as someone else stated. If you give us a call we can sell you the subharness by itself to make it plug and play/seamless.

Thank you very much for your comment.

 

No problem!

Thanks for taking the time to come on here and answer his question along with offering to sell him what he needs to make it work.

Hope you don't mind, I could not find any of the instruction sheets online for your harnesses so I copied the ones I have into a PDF and voided out the cupon.

 

thanks for the responses, i finally got through to the tech line and spoke with mike, he set me up with the sub harness and new instructions.