You're in over your head dude. Just testing for continuity won't find you anything. If it's blowing fuses, it's got
too much continuity, so to speak. If it's drawing that much current, then chances are it's got a short to ground somewhere, or most likely, one or more of the MOSFET transistors is shot. A continuity check is one tool among dozens necessary to diagnose amplifier failure, and is not by any means easy unless there is a visibly obvious problem like a couple of melted wires, etc.
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