I have three guitars: two Stratocasters and one Ibanez S. Their pickup configurations are SSS, HSH, and HH respectively. For the first Stratocaster, I decided to pick up some Dimarzio Injector pickups (noiseless stacked single coils) and had a local shop install them.
Something I notice is that I get hum still. Previously I only got hum in positions 1, 3, and 5, but this time I have hum in all positions. I don't have hum in the Ibanez in any position, but I do have hum in the second Strat in position 3. I'm assuming this isn't an amp or pedal issue and is strictly in the first guitar.
I notice that the hum is exacerbated with gain pedals (I have a fuzz and OD, the hum is more pronounced with both, especially turned up higher) but it's still evident when clean. Touching a metal part of the guitar (eg. tuning pegs, floating bridge) or even a metal part of my pedal board (eg. a switch), it goes away.
I'm not experienced with doing electrical work in guitars nor do I know much about how the wiring is done. I was told they were installed in parallel for positions 2 and 4. I do get hum in all positions, though.
Could they have been installed incorrectly, or is this expected for higher gain pickups? I want to reiterate it does not happen with my Ibanez which has hotter pickups to begin with.