HI SOUFBOY , Theres a few things you need to check , First make sure that your amplifier is getting an audio signal form your head unit,Check all the wires for breaks in the amplifier input, secondly make sure that your 12 inch woofers are still connected to the amp check all the wires . Thirdly check your woofers are they blown ? . The best way of grounding your amp is by scrapping all the paint on a spot on the car body inside the trunk or wherever you have it and making sure the ground wire is securely screwed onto the car body on that spot ..
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