Re: SG Sound Problem
Does it clear up when you wiggle the toggle, or do you have to wiggle the cord at the jack? If it clears up with the toggle, or you lose signal entirely when switching pickups sometimes, replace the toggle with a new Switchcraft one. The little thin tabs that are pushed against or away from the main contact (depending on the switch), wear out and can be bent too far, resulting in reduced contact, and any vibration breaks the connection momentarily.
If it clears up by wiggling the jack, then replace the jack, or bend the tip prong further inward so you get a better connection. Also might check to see if the jack is separating from itself, with the PCB spacers/washers between the metal bits freely spinning.
Just as easy to replace the jack, though, especially if you've got an old junky pedal you can loot for parts.