Re: Problem: Everything Axe Loaded Pick Guard
If you lift the pickguard partly out of the cavity, or move it around a bit, does it fix itself? That would indicate somethings is grounding out when it’s all pushed into the body. If you lift the pickguard out of the body and it still sounds muffled and indistinct, then some component is wired wrong.
Does the sound change as you throw the switch from pickup to pickup? If not, the switch is touching something when it’s all assembled into the guitar.
The problem description sounds like one of two things to me:
1. The switch is bridged so that one or more pickups are always on and/or
2. The tone cap is shorting the entire guitar signal to ground
For the latter problem, I would try electrical tape to insulate the tone cap legs from touching anything they are not soldered to.