I understand that you wrench for a living and appreciate you taking the time to help a fellow owner. If these were expensive parts requiring lots of man-hours to replace, I'd be right there with you.
I've replaced ignition switches on Boxsters because of weird symptoms (radio on/off), lighting, AC blower working sometimes but not others. Never had the ignition switch determine what the charging voltage went to my battery, nor cause otherwise working accessories to suddenly draw more current and run down a battery.
Hopefully, he'll get it sorted out.
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