The British Steelies Society

Can anyone provide me with the wiring diagram for a Clearwater lap steel? It has 2 P90 style pickups, a 3way switch and 2 tone pots and one volume pot. I maybe have a dodgy solder joint somewhere, but something's not quite right, sounding like only one pickup is working properly, and the other hardly doing anything. I had considered rewiring it in a more normal 2 vol 1 tone config, but I'd rather know what the intended wiring I.
Cheers.