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is correct. ...and your question is valid.
That said... I would think that most people would want the mod to stay on the truck side. Someone could have an inline switch to a rigged fan clutch, though - leaving the original fan ummolested.
The big grounding no-no - IMHO - is to run the ground from the switch directly to somewhere behind the dash. Convenient, yes. But, that creates a long path for a relatively high current circuit. ...and an invitation for ground loops.
2004 F550 CC Lariat
BPD oil cooler relocation and upgraded EGR cooler (spooled), BPD oil bypass filtration, aFe Magnum Force CAI, Mishi radiator, 7.3L fan clutch, EC1 ELC, XDP coolant bypass filtration, '08 trans pan/filter, PTP direct clutch solenoid, blue spring, 6.4 starter, MBRP y-pipe, BD boots/clamps, '05 intake elbow, ccv reroute, Torque Pro + OBDLinkô LX, Autometer EGT