So I'm wiring up a Jazz Bass for two stacked pots and a blend pot. I've got it all wired up and basically the bass puts out nothing when the blend pot is centered or rolled all the way forward (to the neck pickup). I did the first sensible thing and disconnected the neck pickup and wired it straight to a jack. It was putting out nothing. The pickup is a Bartolini and if you have any experience with Bart pickups you can replace/shorten the hot and ground which I had to do because I discovered the lead was cinched and had probably severed right under the pickup. I did what was necessary to repair it and was able to get a signal from the pickup. But when I wired it back in but I still get nothing at center/forward. I used the Fender schematic below for the stacked pots but instead of connecting the two stacks I connected them to the blend pot as per the second diagram. I'll get a couple pictures of my wiring in a minute.