Mines been hooked up with an aftermarket switch for a while now with no issues. They work great. Your gonna pay out the butt to hook the up factory because of the BCM. I may have 100 bucks in my whole setup incuding factory fogs, bezels and all the wiring.
2013 Ruby Red Focus SE Hatch
2009 Vivid Red Mercury Mariner Premier
2003 Azure Blue Mustang Mach 1