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Check the connection to the speaker first if not that then, check the connection to the head unit, inspecting the wire also, make sure both negatives and positives are aligned, if its none of the above might have a bad output on the deck or the speaker can be a dud.
This is a rather common problem. The red light indicates it is not correctly getting power.
So trace your power wire from the battery--> check the fuse on the wire if there is one---> to your amp. If that is all in working order next move onto the ground wire.
Make sure it is sparking on the surface that you have it grounded at. If it does not spark when you touch the ground wire against that surface then you are not correctly grounded. It should be bare metal, something connected to the cars frame.
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