I'm sorry to sort of steal your thread, but how about wiring a 2C and a 4C humbucker in the same guitar?
The reason I ask this is because I've recently bought a Vintage (brand) Les Paul with a SD '59 in the bridge and a SD Jazz model in the neck.
This is a great combination, but there's something strange with the two volume controls. When I select the middle position, I should be able to dial in the amount of each pickup using the volume controls. For the bridge pickup, this is the case. But my neck PU volume control works like it should the first half of the sweep, but then acts like a master volume grounding all signal.
This only happens when both pickups are selected. The only difference is that the '59 has two conductor cables and the jazz model has four. The only solution to get it to work how it should ssems to be to cut the ground on lug 3 of the neck volume pot.
Does anyone have a clue why this is happening?