I have a Burns Sonic 1962. It has a complex "quirky" parallel/series wiring circuit with 3 pots, 2 switches and 2 Burns Tri-Sonic pickups.

Here is a discussion that might help:http://www.soundonsound.com/forum/showflat.php?Cat=&Number=666977&Main=661643 Here is a link to someone that might have a schematic if you contact them:http://www.adeson.co.uk/ Also look at their diagrams under Repairs/Technical