Thomas,
 
I don't really know-- I'm just going off the scraps that I've managed to pick up here.
 
My guess is that the power pins are isolated from the pickups (which share a ground).
 
Bradley

What is this thread about?  I missed this one earlier on; and now the first two links don't seem to be working.

If memory serves, the discussion centred around Jan olof Strandberg's 6 string custom - second down this list
 
Graeme

Thanks Graeme!