v502

iTrader: (1)

Need help !!!

Just got done installing a Holley Dominator Ecu and don't know how to trigger the stock fans. I dont have any schematics. Anybody know how the fans are controlled on 07 silverado. I want to trigger them by aftermarket ecu. All options are open.

Need to get this thing on the road Thanks

smokeshow

iTrader: (16)

There are two trigger wires. One triggers a relay to supply 12v across both fans, the other triggers 2 more relays to supply both fans with 12v each. Can the Holley control something like that?

v502

iTrader: (1)

Yes It can trigger both with 12V or Ground whatever I choose. It can control both of them individually.

I just don't know where are the trigger wires have a schematic.

smokeshow

iTrader: (16)

v502

iTrader: (1)

Thanks smokeshow I give that a try

I found 2 pins on ecm that I will try, Fan Low & Fan Hi and see what happens.

Atomic

iTrader: (42)

If you ground the low and fans turn on low, ground both and the fans are on high.