Your tech may have presumed the 8-lug switch adhered to the normal 8-lug pattern, but those old Iby switches definitely did not -- the terminals have altogether different internal connections and functions as compared to a traditional switch. If you're still using the original switch, then many of the online wiring diagrams will be misleading.
Having said that, a few years ago, I rewired my RT650 for a pickup swap and kept some very cryptic notes about the original wiring. For all of this, I name the switch terminals as 1 to 8, looking down at the switch above the electonics cavity. I have no idea what the "correct" way to name/number the terminals is, but that's how I did it. As may be obvious, I am hopeless when it comes to understanding what everything does, but hopefully this will be of some use. Good luck!
Neck pickup: red to terminal #3
white to #8
green and bare to ground on Volume pot
Middle pickup: red to #2
white to ground on volume pot
Bridge pickup: red to #1
white to #6
ground to volume pot (I presume 2 pickup wires were soldered together for the ground, but I didn't note what color(s) those were)
Terminal #4 of switch had a white wire from the left lug of the volume pot
Terminal #5 of switch had a white wire from the tone pot
One more note: I have a couple of "unmolested" RT650s, so if nothing above helps you out, I can probably have a look inside one of those to see what's up.
Last edited by stratoskier; 09-05-2007 at 12:46 PM.
Reason: why not?