Toenail,
I would try to contact Bartoloni through their web site. I found it once but I had to try a couple search engines first ( I think Google worked).
I tried to look in my reference material but I had nothing for Bartoloni. I do think they are probably coil taps and/or a series/phase option.
I put a Basslines Music Man type pick up in a homebuilt fretless and it had the six wire deal also. I used a 3 way dpdt switch that switches from humbucking to single coil series and parallel.
Good luck