I just got an Alpine MRPT220 amp, a direct replacement for the one that got stolen a couple weeks ago. I hooked it up with all the same wires that were left from when they jacked my car. The amp was used for 3 weeks prior to me buying it. It worked fine when I installed it, worked when I drove to work. Halfway home from work my sub cut out, so I figured it was the sub. I got home and realized I blew a fuse........I put another one in and when I turned the radio on, I blew that fuse. I tried it one more time and blew another fuse. Anyone have any suggestions of why I blowing fuses?? I was thinking about taking it to Good Guys where I bought the original and had it installed and complain about it without telling them its not the original one I bought from them, maybe they'll fix it or replace it for free. I was hoping to get some info here so I didn't have to go that route though. Thanks everyone for any input you might have.