usually the fuse near the battery value = total of all the fuses on your amps. so if u have 2 amps with 20A fuse on each, then u can fit a 40A fuse near the batt. what happens now if u put 60A u will allow extra surge of current directly to the amp and rely on the amp fuse to stop the surge, instead of stopping it immediately after the battery. so actually u wont see anything happening at all if u add a larger fuse, just that it defeats the purpose oledi la...