The pickups wiring diagram is confusing. Do you have a simplified version?
Here are a couple of simplified wiring diagrams for 4 conductor and 1 conductor pickups. Please let us know if they are helpful.
Most Bartolini pickups can be used with standard passive tone and volume controls. The diagram below is a very simple setup for passive tone and volume with a pickup using 1- conductor cable. A capacitor of lower value will provide brighter tone. For basses, common values are between 0.047uf (darkest tone) and 0.022uf (brightest tone)

The diagram below is a very simple setup for passive tone and volumes for two pickups using 1-conductor cable.

This diagram shows how to connect 2 single conductor pickups to a blend pot as part of a Bartolini pre-wired harness.

4-Conductor:
Here they are again for 4-conductor pickups. Our humbucker pickups have 4-conductors so that the individual coils can be switched. However, they are most often used in one of the configurations below.
The diagram below is a very simple setup for passive tone and volume with a pickup using 4- conductor cable. This will connect the pickup coils in series for fullest output.

The diagram below is a very simple setup for passive tone and volumes for two pickups using 4-conductor cable.

This diagram shows how to connect 2 single conductor pickups to a blend pot as part of a Bartolini pre-wired harness.




