Originally Posted by
trism
to add further to your question about the fuses, they arent there to protect the amp, thats what it has its own onboard fuses for.
The fuses on the cable are to protect the cable.
Lets say you run without a fuse.
You have a nice big thick 0 gauge cable from the battery up the front, all the way too the boot. And somehow, where it runs under the back seat, it moves around a bit, and rubs on metal, where it wears through the insulation and shorts out on the metal. Its going to flow uunlimited current from the battery. Overheats, melts the insulation, catches fire, burns the car to the ground.
This is why we fuse as close to the battery as possible, to reduce the amount of unprotected cable to no more than about 30cm.
Now, when it comes to a distro block, we are stepping down wire sizes, so the main fuse no longer protects it.
The main wire may be 0 gauge, so we put a 150amp fuse to protect it, but if we step down to 4gauge, then itll catch fire at more than about 100amp, so a 150 amp fuse isnt going to do shit. So we use a fused distro block with 60 amps fuses to protect the 4 gauge.
Ya dig?