I have had some trouble doing the JP wiring on my Black Dogs in my Edwards LP.
There are a load of diagrams on the net, but lots are wrong, I have one which is an easier to follow version of the one on the Gibson site, I don't know for sure wether it works, but I got it from a guy who uses the JP wiring in a couple of LP's
Another thing is you will need some 4 conductor cable for the toggle, the two outputs, usually soldered together need to be split for the some of the phasing to work.
I can send you the diagram I have if you want, PM me an email address if you want it to check against what you have.