My battery is getting drained bad

Well I'm not a wiring wize but so how'd you bypass the amp exactly you just connected the two wires leading to the amp meter? And I ran into a problem today cause I just put a new alternator in it and had a battery charger on it and then when I turned to the key to run position the fusible link burned up all the way to the bulk head. So I don't know what I should do cause I need a running car and the link was already by the looks of it was suffering when I bought it cause it was already kinda melted on the plastic connector.