I slightly mis-read your post Audioraider, I thought you had tried connecting the Fozgometer directly to the cartridge pins, rather than just at the tonearm lead ends.
Try taking the cartridge off the arm and connect the Fozgometer directly to the cartridge pins (via some wire, if you can do that?). If the channels switch as you switch leads then it definitely is the cartridge, as I explained earlier.
Try taking the cartridge off the arm and connect the Fozgometer directly to the cartridge pins (via some wire, if you can do that?). If the channels switch as you switch leads then it definitely is the cartridge, as I explained earlier.