Check to see if you might have some un-intentional short-circuits, and also check that all your pickups are good and don't have any open-circuit windings.
I have found that sometimes those three-way toggle switches can get a bit loose and the toggle doesn't work like it's supposed to, best way to fix that is to replace the toggle-switch with a new one.
Last edited by DrNomis_44; 06-01-2020 at 01:21 PM.