Fuse blows on powered sub. Infinity basslink

[Amaloney]

I have a Infinity Basslink powered sub. When powered, the fuse blows. I opened it up and found the negative lead to the driver disconnected, is there any chance that this would cause a fuse to blow? Or is there a deeper problem in the amp itself? My knowledge in electronics is pretty limited. I bought this sub for cheap and want to sell it since it is not a good fit in my Tundra. Thanks!

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