What are Fuses For?
Fuses are added to your car’s electrical system as a safeguard to help prevent damage to your audio equipment, the rest of your vehicle, yourself, and your passengers. The fuse is a crucial piece of safety equipment that is necessary to have, especially when you’re running wires all the way from the battery under your hood to the amplifier in your trunk.
There are so many variables to installing car audio equipment, including different levels of power, different gauges of wire, different sizes of alternators and batteries, and the audio equipment itself. Between all the things, there is not a lot of room for error.
When a fuse encounters more current trying to pass through it than it can support, the fuse will blow, and the circuit will be broken. This break in the circuit cuts off the flow of electricity and protects everything on the other side of the fuse.
Your amplifier probably already has its own fuses, but they are only designed to look after your amplifier. If you don’t have a fuse, and your battery starts to drain its entire charge into the wires that travel throughout your vehicle and causes them to reach extreme temperatures, you’re going to have a very bad time, and that’s why you need a fuse at your battery.