I just installed my 7/9 blade fans on my 2010 Suburban 2500 using a Nelson harness he made up for me since this isn't a typical conversion for most people. His harness pins to the ECM and has power/ground pigtails, 3 relays and the plugs for the fans.

While installing it the other day, I found that the truck was factory wired for fans, at least mostly. The ECM was already pinned with fuses and relays for fans already in the underhood electrical box. The ONLY thing I couldn't find was if they ran and terminated the wires to the fans themselves.

I couldn't find any harnesses or connectors that were tucked away or anything so I'm not sure exactly how much of the wiring is there. I am more than willing to finish running the wires from the underhood box and terminating them with factory plugs for the fans to utilize the factory wiring.

Can anyone with FACTORY fans on the 07+ trucks shoot me a picture of where the wires to the fans come up and out of the wire looms at? I think the wires may be there, I just need to know what color they are and where they might come from so I don't tear apart all of the loom looking for them.

 

Likely there part of the front lamp harness and are not there. That's how they were on the GMT800 trucks.

They had 2 different harness. one for the E-fan 1500 series and one for the 2500 series with no efan

 

So I am going to have to mimic the 1500 harness from the underhood electrical center to the fans? I assume that is the route it goes? ECM to trigger the relays then route power to the fans?

 

So I looked up a harness and it shows as the whole assembly plugging in under the fuse box.

The Price... from 80-120 online depending on the one you need...

 

Is that a factory harness? I never could seem to find one. If you don't mind please PM me or post up a link to where you found it...

 

I look at various online GM parts house websites. This is one I frequent for parts number diagrams and locations.

OEM GM Parts Online | Wholesale GM Parts Online

I have no idea who has the best price on shipping with any of these types of places.