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I'll take Bills electricall advice over 2 internet electrical degrees anyday. Bill you mentioned a specific ground point, G101, to ground the alternator to. That takes care of the engine to frame rail part of the big 3. What is you recommended points for the other ground.
Well I've had American cars all my life from all 3. 3 Corvettes-never had a problem. Add more wires and the next weakest link will melt, again-unless there is a GOOD reason to do this, DON'T do it.
Any aftermarket equipment that goes directly to Battery + will have it's own fuse to protect it or will want to connect to a fuse in the fuse block.
It sounds like he wants to add another wire from the alternator to the battery.
The BIG 3 is NOT about adding "more" wires..but about increasing the size of the existing wires.
This is especially helpful when adding sound systems.