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I don't have a diagram but I think there's one online somewhere - it might be labelled as switching for a Mustang with humbuckers.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
This one includes the Bridge/Both/Neck switching. https://www.premierguitar.com/articles/24280-mod-garage-rewiring-a-fender-mustang
Ferret around. Use their search engine.
Wire both pickups to the first switch to give inner coils/humbuckers/outer coils:
https://i.imgur.com/OwWkwFJ.jpg
Then take the outputs to the second switch to give bridge/both/neck:
https://i.imgur.com/spxU1yX.jpg
For the coil split switch, you need to connect both pairs of 'middle' contacts together - if the terminals are labelled
A B C D
E F G H
then connect B and C together and use that for the red and white wires of one pickup, and F and G together for the other one. D and H go to ground as the diagram shows, and A and E are the outputs to the selector switch.
On the selector switch, connect B and G together - then to the volume control. Connect A and C together for the neck pickup, and F and H for the bridge pickup - assuming A and E are towards the neck of the guitar.
(The switches are simple 'bridging' slide switches which connect A with B and E with F in position 1, B with C and F with G in 2, and C with D and G with H in 3.)
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Have you tried the Duncan pickups in the guitar yet?
If not, I suggest that, before making extensive modifications to the stock wiring, you experiment with the replacement pickups - hard-wired in single coil mode - via the existing on/off/reverse slider switching. You may find the coil split sounds disappointing.
My own route to cleaner sounds would be to upgrade the stock volume pot to a DiMarzio Pro Parts EP1200 or 1201. This will do a better job of governing the overdrive saturation of your amplification.
The JB has been in the bridge for a while in full humbucker mode, the 59 is a recent acquisition.
You are right, I should try it as is first..
The Li'l '59 is not especially high output to begin with. Coil split would reduce it to approximately 4k Ohms. IMO, a partial coil split might be more successful sonically and retain some hum-cancellation.
Partial coil split involves a capacitor, inserted in the path between the pickup, the split mode switch and ground.