So I got a schecter with SD pickups and the 3 way switch didn't work. All the components were old and broken pretty much so I replaced all the wires, switches, and knobs. Plug it up and have same issue. When switch is in down position it works for the neck pickup. When it's in the middle and up position it doesn't work at all. I have reverified all my wiring and solder joints. Any ideas on what my issue may be?