I bought a Fender Precision knock-off, basically a kit that you paint and put together yourself. I have yet to, after about a year, be able to play it through an amp. This is due to various wiring problems. Since then I have found an online wiring diagram of a Precision and I wired it according to their guidelines. Now, the problem. The bass only plays through my amp when the volume knob is at a very percise and certain spot. If I turn the knob down or up even a fraction, the sound will disappear and it will go dead. If I move back to that certain spot, it plays again. Does anybody know what would cause it to do that? I've tried re-soldering wires to get a better connection, but no dice. Any help would be appreciated.