Not only can I not find a HO alternator that fits my engine, but other alternators I've found with 250 amperage are about $500. The guy I bought my ax2000 us amps amp from had what I think was another stock battery that powered a dry cell, which powered the amp. I have a really heavy duty Interstate Batteries battery, but it's the alternator I'm worried about (the amp is 200 amps, the alternator I have currently is 85 amperage). Any suggestions??