I've recently acquired a used homemade bass with a couple of EMG pickups (PJ) that has 3 knobs, one 3 way switch and one 2 way switch. As far as I could tell when I was testing it, one knob controls neck pickup volume, one knob controls bridge pickup volume, the third controls tone and neither of the switches do anything. When I got the back open I found it to be... quite a mess. The battery is wrapped in a piece of cloth and stuck between some foam. The wiring is all pretty sketchy, there's electrical tape all over it and all the connections seem poorly soldered. Nothing is connected to the 2 way switch and three wires are connect to the 3 way switch but all on the same spot. I've never really dealt with bass electronics before but I would really like to fix this thing up. Any advice on what I should do besides the obvious clean up it needs? Any help would be appreciated.