Combine the output from 2 pickups by switching from the conventional parallel wiring to series.
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The pickups on a guitar are commonly wired in parallel, like on a Stratocaster, meaning they work alongside each other when selected together. Changing them to be wired in series, the pickups are wired together combining their output for a boosted tone. The flick of the switch gives you the option of having them in the standard parallel configuration or in series depending on the tone you are aiming to achieve. I have used this on a HSS Strat to combine the neck and middle pickup in series, effectively creating a humbucker sound from the neck and middle pickups, allowing the guitar to be used in a HH Configuration. The most common use of this modification is on electric guitars.