what could destroy the diodes in an alternator? my sub channel in my amp
kept cutting out (amp didnt go into overheat or overpower), so i replaced
the amp per my installers recommendation. same behavior. he threw it on a
tester, it said bad alternator diodes. i replaced the alternator, my brand
new alternator comes up with the same thing. i replaced the battery as well
with a yellow top.

so the alternator place will send me a replacement alternator but says they
won't warranty this one and something in the car must be destroying the
alternator. ive never heard of anything like this, so im worried about
putting a new one on. any thoughts on what i can check before i put on yet
another alternator?