EMG Pickup problems!!

Hi there, my name is Hudson an dI just purchasd a set of the EMG-ZW's.
I already own a pair and love 'em. The problem is that when I switch
from the Rhythm pickup to the treble there is an extremely noticable
volume drop. Now I had some extra EMG pots so I switched them out to
see if it was a faulty pot. Same thing happpened. I then used another 81 I had
and the same thing happened. It is all wired correctly and every connection
is solid. What might my problem be?

Thank you,
Hudson