Yeah throwing alternators at the problem wont solve anything. I see way too many people make this mistake on the newcougar forums.
The MegaFuse wire and Gnd wire to and from the alternator are likely to be damaged when your alternator failed the first/2nd time. This extra resistance in the line then causes your other alternators to fail.
Have those wires replaced. That should take care of your issue.
Its all about proper trouble-shooting and not just throwing alternators/money at the problem.
I dont believe the amp would cause such a problem. Though not impossible
