Im installing a new Rockford Fosgate amplifier. Is it necessary to have a fuse at the battery?
Yes, it is absolutely necessary to have a fuse at the battery! That fuse will protect the amplifier’s main power wire (and the car!) in case it shorts to the car chassis. It is acceptable to install the fuse that comes with the amplifier at the battery. It will then serve to protect the amplifier and the power wire.