Radiator fans aftermarket wiring

Unfortunately, there would be no way for us to know how this is wired because not only are there many aftermarket options, but they may have not even wired it according to the kit that they installed.

Which may be part of the reason it is not working.

The only thing I can suggest is that we need to use the factory wiring diagram that I attached below and start at the fans and trace the wiring back to where it leads.

https://www.2carpros.com/articles/how-to-check-wiring

Basically, each wire should be leading back to relays, so we need to trace these wires and make sure they are leading there.

Then we need to follow these wires back to the ECM and then lastly the ECM has a cooling fan relay as well.

If you don't have these three relays, then I suspect the issue is the ECM is not turning them on because it can't.

However, most aftermarket kits come with their own temperature sensor which turns them on, so we need to check the temperature sensor as well.

Please take a look at the diagram and let me know what you find. Thanks