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Grounding ac plug

The hot and neutral wires get connected to the same places your current ones are on your 2-wire cord. The 3rd ground wire gets connected to the amp chassis (metal case the amp is built into). Having the items linked in Bill's post is a good idea as well as long as you're in there. If you're uncomfortable with it, it's an easy, inexpensive thing for a tech to do, they could also scope out your amp while they're at it, just give it a "check up" and it won't cost too much.