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Hi, I'm Mike G and I'll be glad to assist you.
1) you'll need a 100A disconnect at the meter
2) 2 ground rods with #6 copper wire between them to the disconnect neutral bar.
3) bonding screw in disconnect.
4) neutral and ground from sub feed to neutral bar.
5) neutral and ground on separate bars at sub panel.
6) ground rod with#6 copper to ground bar of sub panel.
2-2-4 Al will do.
120ft..is the garage attached or a seperat building?
You need to do it as I originally stated. The 4 conductor 2-2-2-4 is correct.
Read my first list of instructions. Your garage will be a sub panel with a main breaker. There has to be a 100A disconnect at the meter location. All grounding and bonding is in the disconnect, not in the meter.
Because it is the same building. If you have a 200A service why aren't you originating the sub feed there?
Current code requires a disconnect at the meter and the line to the garage is a sub feed 4 wire. It would be diffent if the meter was on the garage.
Yes, that's exactly what I said. One more thing, if this is a new building there should be a ground #4 copper to the footer rebar.
Existing building doesn't need footer ground. The panel in the garage is a sub panel with a main. The neutral and grounds are on separate bars. The bonding screw isn't used. The disconnect is the main for the sub feed.
Yes you will.
That's a bonding attachment. Remove it.
When you install the ground bar, that will ground the enclosure.
Meter to disconnect 3 wire.
Disconnect to sub panel 4 wire.
It has to be a 2 pole 100A fused or breaker disconnect.