strat wiring/ cts pots??

[drzdud]

Help!
I've buying and upgrading MIM strats, and selling them.
All American parts, etc. Some of the pots have said cts on at least one of them. I have 2 new sets, one pot says cts on it. there is one extra black wire(another ground??), when I wire up this set the same as a standard, I can only get sound from one(really 2, but the sound doesn't change) 5-way position.
The switch position is bridge and the sound is nothing like a bridge pup, I think i'm getting sound from 2 pups from the bridge position.
Any help would be appreciated.
Thanks,
Jim

[wesman]

Try this diagram:
www.seymourduncan.com/support/schematics/3singlecoils_1vol_2tones.html

Plug the thing in and lightly tap the polepieces with a screwdriver to see which pickups are on in
each position.

Is the switch a standard Fender switch or an aftermarket item?