KC Mustang switching? Tremelo?

[DasBeef]

Gotcha! Cheers. I had a play with mine last night, and there did seem to be less out of phase options.
Why did they do this?

[paul_]

The difference is the criss-cross wiring on the bridge pickup selector is just like the Mustang, phase reversal. Essentially it swaps out the hot and ground wires on the pickup to change the pickup's wiring to be in or out of phase with the other pickup. Mustangs originally had both pickups wired to be both in and out of phase. This is designed to work with the Mustang's 2 wire single coil pickups, one wire goes to ground, one goes to the volume pot, and the switch changes which one goes where, and also breaks contact in the center position to prevent the pickup from making any sound at all.

The secondary Jag-Stang wiring diagram is different, it foregoes the original Mustang wiring by making the bridge pickup switch work the same regardless of position. I think they just put positive and negative lines on the same switch to make the guitar easier to wire and to have a direct connection to the switch instead of another wire that has to go to a ground somewhere else.

The guitar still has all the tonal options of a Mustang the way it's wired, you just can only get the out of phase setting with one switch configuration instead of two. So they were making it easier for themselves and keeping all the sounds, not a huge deal. You have everything you need to convert it to regular Mustang wiring if need be, just use the Duncan Mustang diagram.