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That MIGHT not work, as the upfitter supplies power. You would likely have to wire in an additional relay to switch ground, as it's likely ground controlled. I'm looking at the wiring diagrams, workshop manuals, and powertrain/emissions control manuals, and not getting a clear cut answer of what controls the fan, be it power, or ground.
All it tells me is that it's a "pulse width modulated" control circuit. Gee, thanks guys.
I would ASSUME it's a ground modulation, seeing as how it's controlled from the PCM directly, not through any relays or junk. And of course, there's no label on the PCM connector diagram to see whether it's power or grounded that turns it on/off. There's TWO pins for it at the pcm connector.
Let me do some measuring this week and see what I can come up with. I am not entirely sure if there's going to be a good answer, or at least what you're looking for, unfortunately. I think at the very least we're going to turn a check engine lamp on doing this, as it will see that as a short to ground or power, I think. Depending on what we have to add to make the clutch come on.
Ford Senior Diesel Technician
2008 F-350 4x4 Off Road 6.4 Powerstroke Diesel
There are strange things done 'neath the midnight sun by the men who moil for gold.
The arctic trails have their secret tales that would make your blood run cold.