Boss Audio MC520B Support Questions

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Power
No power and no sound

Amp An Speakers
https://www.manualslib.com/manual/1227976/Boss-Audio-Systems-Mc520b.html?page=2#manual

Power
https://www.manualslib.com/manual/1227976/Boss-Audio-Systems-Mc520b.html?page=6#manualcheck fuse 7.5...

What Fuse Can I Hook Into So Mc520b Will Work When Ignition On Accessories
Here's a video that explains it's installation; https://www.youtube.com/watch?v=PmSX7f8A8XY

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