Sharing a not-so-simple rewiring job by Sir Mike!
On the surface, it's a straightforward mod from HSS to HSH (pulido as usual):
But I found an interesting schematic on the net using a 4-pole 5-way super switch and a DPDT mini-toggle:
It took a while to troubleshoot, but Sir Mike was able to get the wiring sorted out. Now you can basically switch the guitar from a strat (SSS) to an HH guitar with the mini-toggle:
SSS mode:
position 5 - HB neck split (north coil)
position 4 - HB neck split (north coil) + middle SC
position 3 - middle SC
position 2 - middle SC + HB bridge (south coil)
position 1 - HB bridge (south coil)
HH mode:
position 5 - HB neck
position 4 - HB neck (north coil) + HB bridge (south coil)
position 3 - HB neck + HB bridge
position 2 - HB neck (north coil) + HB bridge (north coil) in series
position 1 - HB bridge
Tone 1 controls the SSS mode, while Tone 2 controls HH (although Tone 2 also controls the bridge in SSS).
It's a very versatile setup for HSH guitars. All you need is a Fender superswitch and a DPDT on-on. Kudos to Sir Mike!