Is it necessary to have a fuse at the battery when running power wires?
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's chassis. A power wire can be cut into or severed in the event of an accident, and you sure don't want sparks to fly because of an unfused power cable touching the car!
It is quite acceptable to install the fuse that comes with the amplifier up at the battery. It will then serve to protect the amplifier and the power wire at the same time.
The correct mounting location for the fuseholder and fuse is within 18 inches of the battery's positive (+) terminal.
Make sure to keep your cable away from any sharp edges and surfaces, and cover the wire with split-loom tubing to add extra protection.
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