To get a hum-cancelling effect the coils has to be wound in opposite directions, otherwise you´d end up with a pickup that´s only two single-coils in one. however, the coils may be wired in either series or parallel, with the hum-cancelling effect preserved, but wiring two coils in parallel results in a very weak signal, compared to that of two coils wired in series.
Check out a new and an old strat for a good example of the necessity of opposite magnet directions for a hum-cancelling effect. on an old strat, all the pickups are wired the same, and position 2 and 4 has just as much hum as any other position, but on a newer strat the middle pickup is wired the opposite way, thus implying a hum-cancelling effect to positions 2 and 4...
Check out a new and an old strat for a good example of the necessity of opposite magnet directions for a hum-cancelling effect. on an old strat, all the pickups are wired the same, and position 2 and 4 has just as much hum as any other position, but on a newer strat the middle pickup is wired the opposite way, thus implying a hum-cancelling effect to positions 2 and 4...
