[Navy I.C.]

the thick cable that connects your battery to your amp is your 12v powerline. re-check that entire cable run, and make sure the only exposed wire is on the ends where they have solid connections. if you have a voltmeter built into your dash check that your output voltage is between 10-17vdc, because current (amps) is directly proportional to voltage. more volts = more amps, and if it exceeds your fuse rating it'll blow. if you need to, use a stand alone meter to gauge your output voltage.