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One issue is the starter solenoid when the contacts separate in the switch that huge coil in the the solenoid creates a large high voltage reverse polarity pulse (that pesky reverse EMF I am always preaching about) if the contacts do not move apart fast enough OR far enough from each other or...

Welcome to the forum, common wisdom is any keyed switch will cost you dearly in the end, none are made to take the loads and voltage the HMMWV puts on the run switch, it is said that many expensive starters and EESS boxes have died at the hands of a keyed switch.