I'm afraid that I'm a bit of a dunce where anything electrical is concerned, so I'm throwing myself on your (collective) mercy here . I have just accquired a 1986 Westone Spectrum GT bass, which has two pickups (one "P" style and one "double J" style), a three-way selector switch, a master volume and front and rear passive tone controls. Everything works as it should, except for the tone control for the rear pickup ... When I roll off the treble, it acts exactly as a volume control and simply fades out the signal . I guess that it's a problem with the capcitor or the pot, but I'm really not sure. Could it also be a problem with a short in the pickup windings (I seem to remember a similar issue with a Jazz Bass pickup that I had, which needed re-winding )? Here's the wiring layout in the control cavitiy: So, any advice please ?