I've wired up a hotrail on a stock Mustang switch as: split/parallel/series, so I'm sure what you're trying to do can be done.
You would lose the phase option with both pickups, though. Both switches would need to be wired to the pots in parallel..
that's weird my hotrail doesn't work anymore. I checked all the wiring, no sound at all even if i plug directly on the volume pot. Last year it worked.
it's from a small italian brand, not as good quality at a seymour duncan but it liked the sound.
someone has already had that problem?
That's a pretty easy one. Provided you have an on-off-on switch, the ground, the shield, as well as green goes in the middle. Black goes on the right with the cable to the ground. White and red together go on the left.