I have a Geddy Lee Jazz bass that is giving me some grounding troubles. There's no hum as such, (apart from the obvious single coil hum) but whenever I touch any metal parts I get that annoying clicking sound out of my amp telling me something's being grounded. I took off the control cavity and bridge to investigate further, when I physically hold the end of the ground wire the click no longer appears, yet when I place it under the bridge the click reappears! I'm really frustrated with this at the moment. Could be a case of replacing the ground wire?