Not sure on the newer trucks, but on the 97 and older trucks there was a "module" that plugs in the wiring harness behind the switch, on those, remove the plugs from the module and plug them into each other, rather than the module, and DRL is gone.... back to standard US Headlights...... that plug is on all the trucks, just the ones with DRL have the module.
Maybe something the same on the 99+ Superduties.......