4 Control wiring Harness with Vintage Tone Selector for 4003 and 4001 Series Basses . With a simple pull of the treble tone control,  a player can move between both sounds at the drop of a hat. Switch between regular and “Vintage Tone”.

Some aftermarket wiring assemblies have adopted a different layout and connected the tone capacitors to the volume controls instead of the selector switch. By doing this they have introduced a flaw which is that when a pickup is switched out of circuit, both tone controls are still connected and either will affect the connected pickup especially noticable when both volume controls are set to maximum and a muddy sound will be the result.