I'm just wondering if there's a digram around that I could use to have my SSS strat go from paralell to series?
Basically, I'd like for the guitar to operate normally in positions 1-5 when the switch isn't engage, but when engaging the switch I'd like to get these new sounds Neck + middle in series, Neck + Bridge in Series, and Middle + Bridge in series.
JohnH's "Strat SP" design gets close to what you want, except that it has B + N at position 3 instead of M alone, as on regular Strat wiring. This will require a Superswitch and one P/P pot. John has a second P/P for phase, but that could be omitted if desired.
To do exactly what you want would require more switching. John's design works with just a P/P because the B + N is at position 3, and is then converted to B X N when the switch is pulled. To switch from M alone to B X N would require (probably) a 4-pole toggle switch, and even then I'm not sure it would be feasible.
I was also going to suggest Mike R's design. But like the SP of mine, it is a wiring do-over with a new 5 way superswitch needed. You could also consider a simpler option that keeps most of a standard wiring. This is my favourite simple wiring for series/parallel, which does most of what you want: