I have two mtx amps hooked up in my car. I had my system for over a year and one day my 60amp fuse blows. Now I checked around to see if there was any short around my wires and I couldn't find anything. I replace my 60amp fuse and a day later the 60 amp fuse went out again. What can cause this to happened? Also I use 4 gauge wires and I have a 1.5 cap. Thanks for any advice you guys can give.