Any idea which terminals on the HD fan do what? Typically there's power, ground, and a PWM signal. I'm wondering if I could run an aftermarket PWM controller from Mishimoto or something. Or use the PWM signal from the ECM, if there is one on this vehicle. Not sure how Ford cals things, but GMT900 SUV's had a PWM signal even though the cooling fans were series / parallel.
I'm definitely not finding much info out there about Ford's HD cooling fans, and I'm also not finding any HD fans that use the stock 2-pin terminals, either. I'd be cautious about running aftermarket fans in general, since they are usually lower power and less efficient than OEM.
It's possible that I could upgrade the entire forward lamp harness in the engine bay, too, but I'm thinking that's risky since it looks like the same harness runs the ABS module, the headlamps, and the cooling fans, to name a few things. Not to mention I'm not sure if the PWM signal wire would be in the remaining harnesses.
