Disclaimer : when I received this guitar, the wiring had been modified, so I'm not 100% positive about the accuracy of the wiring below. Let's say it's 90% sure... please contact me if you think different.
4 way switch, it was called "3 way plus change to Rythm" in the 1963 Montgomery Wards catalog.
- Neck pickup alone with added cap in serie, it cuts the low frequencies, this should be the so-called "Rythm" position
- Neck pickup alone, direct connection
- Neck and Bridge together
- Bridge pickup alone
Below, the wire from the switch to the jack was replaced by me (it's a double white & blue shielded wire, but white and blue are soldered together, there was no need for two wires). All other wiring and parts (apart from the temporary switch knob) are original.
The 4 way rotary switch has two circuits, four positions.