Jim Dandy wrote:What could cause a stock unmodified 4003 to have a very low and thin volume in all switch positions (compared to another 4003 through the same rig), with both the bass and treble tone controls acting as volume controls (instead of tone controls), and the push-pull switch not to work? Both of the volume controls and the 3 way switch seem to be working ok. Both pickups are giving sound, but I can't tell much more than that about them.
If the volume is down and both the volume and the tone knobs are acting like volume knobs, you may have open coils in the pickups, which are then functioning only on inductance, not as a complete circuit. Carefully unsolder the hot leads, one at a time so you don't forget where they go, from the selector switch and measure the dc resistance of each of the coils. If you don't have something steady in the 8 to 12 kohm range (for example, if it's higher or lower than that, or if the reading won't stabilize, or if it goes to infinite ohms) then you have pickup coil problems and may need to replace the pickups.
I wonder!!! 
It's just because I played my Rick the last years with all pots at "eleven" 
, but last week suddenly realized,