Well, solved half the issue (of sorts).  The hot swap
controller has a power good pin, that if the switched
side of the FET has voltage (set by a divider) then it
stays off (pup'd), and if it drops out due to a bad
FET or bad something, then it drives low.  OK, well at
least I don't have to sense it now, but since the
ground reference is still wrong, looks like the only
way to do this is an opto (safest way at least).  What
we do to save a few bucks, but makes the product not
as reliable.  I'm already using an opto, so guess one
more won't hurt much.

Thanks for all the suggestions.



		
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