Tom,
What year is your Boxster? Taking the cue from your post I wired my 12v Switched for my 12V Power Steering pump from D4 however when I am checking the same with the DVM I find that it is 12V Batt and not 12vSw since it is always 12V so far as the battery is connected. Bummer...
Any suggestions where else can I find 12V Sw in that vicinity?
Thanks!