Oh i had an old amp lying around, and pulled out all the cables from there, cause im asian :)
This one had no fuse. So i didnt bother getting one
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I'd disconnect it from the battery straight away, and get a fuse ASAP. It is unsafe, whether it's switched on or not, without a fuse. I have electrical engineering qualifications, and always use fuses in cars, as close to the battery as possible. The large cables often used for amp wiring carry serious amounts of current, and will get red hot very quickly if they short to earth.