I just put some Bill Lawrence L500's in. All i have is one volume and a 3 way toggle. All my solder seems firm and good but I still dont get any sound from the pickups unless i touch the output jack and the 3 way at the same time. I'm guessing its a grounding issue but can anyone tell me what to do here.
The diagram you posted is different from the one I used. Let me see if that makes a difference.
Just read this post. Were you able to fix the problem or error? I think they have a diagram in the their site.

Just got and installed mine last week.