Here's one! If your amp is blowing fuses, here's a simple way to troubleshoot without tearing it appart:

Completely disconnect the amp and remove it from your car. Replace the fuse with the SAME EXACT rating (probably 25 amp). Now you will need a digital volt meter. If you don't have one, you can't troubleshoot the amp, but I'll explain anyway incase you do. Set the meter to diode or continuity check (or you can set it to impedance check but you will need to read the display instead of just listening for the beep). Check accross the 12v constant and ground taps on the amp. If it beeps or reads 0.00 ohms, you have a direct short in the amp, most likely two or more mosfets are blown. If you don't have electronic training, I don't recomend or encourage you do attempt servicing. If done wrong, bad news. If you have any more questions, please post and I'll be happy to answer.