slickcat's idea is a good one for a short test. IF the Pups are good, then it may just be a bad potentiometer. Depending upon how it's wired, sometimes the two pups are actually loaded together. That is, when one volume pot is turned all the way down, both pups are off. So, if one pot is wired incorrectly or is bad, it could have the same effect as having the pot turned all the way down, thus, turning off the volume.
if you have a VOM (voltage-ohm-milliamp meter) then you could ohm out the pots and turn them to make sure they respond.
Oh, and I did get a chuckle out of the nylon string comment, heh heh heh. Gotta use humor or I'd go nutz!!!
