Right, I've had enough of this now!
Last night I wired in the series switch, one silly mistake aside it works, and the pickups in series sound great, getting that mid push I was after.
The problem is I have a massive earthing issue, huge noise when touching anything and an actual 'crack' sound when I touch the neck pickup. I spent hours checking, double checking, desoldering, resoldering, adding extra earth's between everything in desperation, even took the bass apart again and soldered the earth to the bridge instead of it just being trapped underneath. Nothing would sort it.
Had another look this morning with a fresh brain, tried some different things but nothing will fix it.
In the end I have clamped a wire on the outside of the pickup housings linking them together (metal toaster style) and the noise vanished, but so has the series switching. When put in series mode I get the added mids, but with noise if I touch the bass pickup, until I link the two pickup housings when the noise goes but it goes back to parallel sound.
What's going on?
I really like the series sound, it's exactly what I was after so don't want to give up but I'm at a loss as to what to do.
Help! 😟
Edit. I'm also guessing that if I did away with all the wiring needed for switching between parallel and series and just wiring it in series I'd still get the same problem if it's something inherent in the design of the pickups?