Quote Originally Posted by D3210210 View Post
Hey just throught I'd throw something simple out there.

I doubt this to be relevant to your situation, but I've had a similar problem that I just could not figure out... I suspected a loose solder joint somewhere but I went over every joint and it wasn't that.

Turns out I'd over-tightened the nuts holding one of the pots in and it didn't like it. Loosened the nut on the problem pot and that resolved the issue.

As I said, probably one in a million for that to have been the problem, but it's free and easy to test.

Failing that, I'd suggest finding a multimeter to start testing continuity, while following the wiring diagram, that the good doctor provided above.

I've been there and done it too, it's a very easy mistake to make, overtightening the mounting nut for the pots, I seem to remember doing that once and ruining a perfectly good pot, I also seem to remember muttering some pretty "colourful" words after I had realized what I had done too, complete with feelings of utter embarrassment.