Guitar Question?

[WorkBench]

I know this is off topic but,..... I just added a third humbucker to the middle position on my Ibanez CN250.  It seems to be sucking tone from the other two original pickups, and I can't figure out why!  Any knowledge?
Chris

[rubberlips]

Maybe a diagram of how it's wired up would be good to start off with, probably got something to do with the selector switch

Cheers

Pete