Just updating on this. So far the pull push vol works as standard, the tone knob works as should. The 3 way switch replaced with another, the same issue. Feels like neck single coil is working. When switching to series and parallel on the 3 way no sound. Tech said the he checked the other wires for resistance making sure coils were producing and sounds like they were. Only thing I can think of is require the pickup?
Il get it this week and can upload images etc . Also used the wiring diagram ss4 from Sterling.