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Pickup grounds usually go to the back of one of the pots....
It's not a bad idea to shield the cavities, but not usually essential. It's usually more important with the control cavity than the switch, since the volume pot is a bit more prone to picking up noise when it's set somewhere between full and off than the switch is.
Having the volume pot casing touching the foil is in fact the easiest way of connecting the foil to ground, so you don't need to do anything else - same with the switch, the switch frame should be grounded and this will then contact the foil in the cavity.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
A classic bad wiring scheme is the original Fender Tele which has the pickup grounds soldered to the volume pot and the jack ground to the tone pot, relying on the contact through both pot casings and the metal control plate to complete the circuit. This can cause noticeable hum, especially on older guitars where the metal has got a bit corroded.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
In that case, the switch is normally wired so pin 4 goes to the volume control and 1, 2 and 3 are the pickup connections - which way round 1 and 3 are for the neck and bridge pickups depends on the way the switch is mounted. (5-7 are for the tone controls in a Strat.)
But... that's a crap switch. I would replace it with a CRL open-frame one first, it will be better in the long run.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein