I have a set of APG T-sized blade pickups in my Tele. There's a set of two rails within the pickup similar to a Barden in design. It's wired with a master volume/tone, 3 way switch and a 2 way on-on switch that toggles the pickups between series and parallel. I've recently lost sound through the entirety of the neck pickup, and only the bridges humbucker sound is able to be fully utilized. Strangely when in parallel the bridge pickup only produces output through the A D B and e strings. The low E doesn't produce signal and the rest are very quiet.
I've taken a look at the wiring job from my last tech and it looks very professional, excellent looking joinery on all connections of the on-on switch, nicely adhered no big globs, no loose connections, though there are a lot of them, could be heat related. However I've heard that these variants of switches can fault out relatively quickly, or don't tend to last long. It is a switchcraft so not sure what better I'd find, but my new tech has suggested perhaps replacing a pot with a push-pull for the series-parallel but I'd really rather the sturdy metal switch.
Any ideas? Is the lack of output because of the switch, or should i be worried about the integrity of the pickups? (been told it's doubtful they've demagnetized, especially both not working apart from bridge) if it is the switch, what's my best buy when looking for a hardy switch for such a job?
EDIT: http://apgpickups.com/wp-content/uploads/2019/02/TBDT-Wire-Diagram.pdf This is the wiring diagram that was used.