Re: Mustang Wiring Mod
The normal Mustang slider switches are eight contact, DP3T on/on/on types. (The "off" position is achieved by the jumper connections between the switch's contacts.) Hence, it is possible to have one pickup slider switch offer the usual on/off/reverse and have the second switch offer on (parallel)/off/on (series).
Series, out-of-phase gives a honky sound, somewhere between Kurt Cobain and Brian May.
I performed precisely this mod on a Squier VM Mustang. I will have to raise the pickguard to photograph my wiring. Alternatively, I may have already run a thread about precisely this wiring question.