Peavey T-60: Dead Tone Pot Question
So I got this old Peavey T-60 from my uncle, who got it from my other uncle, who got it from my dad, who got it from some guy in the 80s who used to go to parties and play "Cocaine" all night long. Great story eh? Pics below for your enjoyment. Anyway, the guitar works great, its all set up, has a bone nut, and I love the phase switch and the humbucker to single coil tone pots. There is one problem however: the bridge p/u tone pot works from 10-7 (Which on a T-60 goes from single coil  to humbucker ), however from 7-1 the pot does nothing (it should work like a normal tone pot, the neck p/u works this way). I know nothing about wiring guitars, especially something different like this, so I'm wondering if any of you guys could help me out or point me in the right direction.
P.S. Found a wiring diagram on google, I don't know if it'll help or not though.