Please be patient with me as I am very new to G & L basses. I just acquired a 2014 USA L-2000. I am a bit confused as to the parallel/series switch. Is the series essentially a coil tap? On the G & L website it sounds like when in series the humbuckers are changed to singles in series to produce a jazz bass type sound!
Welcome aboard!
Think of each pickup as having two coils of wire, each surrounding a set of 4 permanent magnetic pole pieces that you see emerging as the screw adjustments on the top of the pickup.
In parallel mode, each of the two coils in the pickup acts as a separate circuit, with the induced currents in each—produced as the string moves within the magnetic field of the pole pieces— passing independently (but more or less simultaneously) through each individual coil before being summed up at the end.
In series mode, the two coils are linked together to form a single circuit. The same induced current runs through one coil and onward through the second coil (passing through both).
If there were a single coil operation (which can be had with an L-1000 or even with an L-2000 that has a switch modification), the induced current would flow through only one of the coils and the other coil would be ignored.
In practical sound terms, the parallel mode will seem a bit thinner, brighter, and more rich in midrange frequencies, while the series mode will seem more bass-rich, a bit mid-scooped, warmer and louder overall.
Hope that helps.
Edit: I was thinking afterwards that it may not be obvious, but the parallel/series switch makes a change in the way that *both* pickups function—regardless of whether you have selected the neck pickup only, the bridge pickup only, or both. It's not possible to have one pickup in parallel mode and the other in series mode.
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