4 Control wiring Harness 4003 and 4001 Series Basses and some guitars. Made using all USA OEM components. Made to vintage specs using 250K volume and 500K Tone controls.

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.