I just rewired a knock-off hollow-body Tele. It had gotten wonderful reviews online, but when I got it home, it was just terrible. I have to wonder whether the manufacturer and family and friends were responsible for the wonderful reviews. I plugged it in and got the worst hum I've ever heard from a guitar in my life. The fret ends were so sharp, I could have cut the skin of my left hand playing the thing. I could not produce any musical sound worth listening to on it.
My response was to decide to rewire it and upgrade it. I got new pickups. I got a wiring kit with a four-way switch. I got heavy brass bridge saddles. I got tools to dress the frets, which were just awful. Anyway, I am confident of my soldering technique, followed the schematic carefully, cautiously checked all connections by gently tugging on them, and all appeared fine, but when I got it all put together and plugged it in, there was no sound through any of the 4 pickup selectors.
The instructions said that if neither a metal control plate or some kind of shielding plate was being used, the tone pot needed to be grounded to the volume pot. With the horrendous hum when the guitar was new, I painted all of the cavities with conducting paint and used the plastic finger guard, to which the neck pickup is mounted, with a foil shield pasted on the underside, in direct contact with a considerable area of the conducting paint. I was unsure, even though I thought it likely, whether this was what they meant by a shielding plate, so I did ground the tone pot to the volume pot. Is there potential that that is why I am getting no sound, or is that just a redundancy that shouldn't cause an adverse effect? I think I have a half a memory that too many ground connections can cause trouble, and that would certainly be an easy thing to fix if it is the likely cause. If that does not seem a likely explanation, though, how on earth do I sort this out, when everything looked just as it was supposed to be?