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Series Parellel Switch

It switches between two wiring possibilities in your pickup - series and parallel. It's easier to explain what that is with a diagram, so please just Google/Wikipedia it. It's easy to find and easy to understand.
 
A series/parallel switch is a switch that changes the configuration of two sources (Either two pickups, or the two coils within one pickup if it's a humbucker) from series to parallel.


Parallel:
301px-Inductors_in_parallel.svg.png

Series:
390px-Inductors_in_series.svg.png


"L1​" and "L2​" represent the two pickups or coils in question. (Ignore "Ln​")
One white circle represents the output, and the other represents ground.

A series/parallel switch allows you to switch between these two configurations.
 

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