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2015 Murano SL with only 6k miles NO SOUND FROM SPEAKERS. Bose #15 Fuse is blown, each new fuse blown also! help!

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Hello,
My 2015 Murano SL sound system suddenly stopped working yesterday. Everything else is fine and functional. I checked the "Bose" fuse which is a blue #15 and it was burned out. I purchased new fuse but each time I placed the new fuse in the slot it sparked and the new fuse also burned out.

Has anyone else had this problem? I only have 6K miles. I have always driven another vehicle (My pickup truck) but I gave it to my Grandson. I am the only owner of my Murano and purchased in brand new in 2015. I have never had any issues with my Murano. It has never been it a shop for repairs.

HELP!

Thanks in advance!
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Was it parked for a while before this happened? Have you seen any rodent activity? If the fuse is popping soon as you are plugging it in then you possibly have a short to ground on the load side between the junction block and the amp or in the amp itself. If you have a voltmeter, switch it to continuity and test the load side of the fuse slot to ground (body of the car) after unplugging the amp. The amp is in the cargo area (see image below) pull the plugs off that to remove ground. If you have continuity after unplugging the amp you have a short somewhere in the line. Use the diagrams below to follow the line and look for pinched wires or damage. You could also go through and unplug some of the wire-to-wire connectors and test again to narrow down which section has the short. I would check the sections under the doorsills first. If there was no continuity in the line after unplugging the amp then the problem is in the amp itself.

The red dots mark the power line and associated connectors.





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Has anyone else had this problem? I only have 6K miles. I have always driven another vehicle (My pickup truck) but I gave it to my Grandson...
Grandsons have been known to try DIY audio system modifications. Have you asked him if he's been messing around with it?

The only thing I would add to @Ramness excellent post is if that fuse blows with the amp unplugged then that would pretty much also confirm a short in the wiring. Also, it looks like that wire to the amp is hot at all times based on the diagram so if you probe the fuse socket verify which pin has battery voltage before doing a continuity test or you could accidentally smoke your multimeter.
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