And ... another rewire . . . .

OK, after a while the neck pickup in the JM developed an annoying ... seemingly unreproducible problem . . . scratchiness . . . anyway it was painfull to listen to SO back to the diagram and trying to find WHERE I went wrong . . .

Well no faults leading to scratchiness were found . . . BUT . . . it look like the humbucker coils were wired out of phase . . . OUCH . . . start and end somehow got interchanged on the P90 part of the pRails.

EDIT / UPDATE: NO, no, NO . . . they were NOT . . . it's now been corrected in the next post

OK so here is the new diagram . . . and apologies to anyone who tried it . . .

So I took the whole instrument apart and . . . well in the end I think that an non insulated ground wire in the pickup coil switching circuit occasionally could make contact with the hot signal from the neck pickup depending on the vibration and other factors . . . not solid contact mind you, but just kinda glancing off of it ... thus the scratchyness . . . ??? . . . that's the only thing I could find remotely problematic electrically . . . and of course . . . it's hard to see through a solid wood body or pickguard and things undoubtedly move on installation and . . . . 

Also took the opportunity to rout out some 'tight spots' where the pickup legs were a 'tight' fit and to rout a shorter path from the bridge pickup to the coil switching circuit in the upper horn . . . and debating whether I want to coat the whole interior with copper shielding foil while I have it apart . . . 

Anyway here are some shots of work in progress:

First shot is the coil switching circuit being built. The second has the coil switching circuit and the phase switch complete and the rotary pickup selector switch is being built. No cloth wire this time, it's not bad to work with but I didn't have enough for a complete rebuild and it's more bulky than the silicone insulated hookup wire.

Volume & tone next week, I have to have a look at the tone circuit before I put that in (EDIT: done that and yes there was a mistake that has been corrected), the SPDT on/off/on switch should switch the tone circuit before or after the volume pot . . . just to try if it make a difference (quite possibly not), the other switch should give me a straight cap like a normal tone circuit OR a version of the Fender grease bucket circuit . . .