#1
to coil split a Seymour Duncan humbucker that is wires in series, i just take the red/white wires and attach them to a switch that grounds them to split the coil, and in the other position doesn't ground them, letting both coils be used, correct?
#2
Yes, if you want to have the active coil in coil-split mode to be the non-adjustable pole peices.

This diagram will show you what I mean.
Will says:
DON'T FEAR THE REAPER!
- SmarterChild - says:
I don't know if I can help it.

Member #6 of the "I play my guitar as high as Tom Morello does" club
#3
thanks for the diagram. which do you recommend? i'm not sure what it means to be adjustable.
#4
Adjustable = the side with the screws.
Slugs = the side without the slugs.

As for which one I recommend, it depends entirely on the polarity of each coil. I'm not sure of what the polarity, but the standard is to split the pickup so that when the pickup is split, the non-adjustable coil it used.
Will says:
DON'T FEAR THE REAPER!
- SmarterChild - says:
I don't know if I can help it.

Member #6 of the "I play my guitar as high as Tom Morello does" club