Re: Newbie humbucker wiring question
1 is normal "series", 2 is "in series out-of-phase:, and 3 is "parallel".
In the case of a humbucker, the coils out of phase with each other will cancel all same-frequencies. Since it is likely the coils are wound exactly the same, and placed side-by-side next to each other, there are going to be very little if any different frequencies between the coils. These left-over frequencies that are not cancelled out will be all that is heard, along with the 60 Hz hum.