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Could be anything from low cold cranking amps to a shot alternator. First thing you do is check the connections from the battery to the alternator to ensure its able to recharge properly. Then take your battery to an auto parts store such as Autozone or NAPA and get them to test the battery. If...

Ok, so you want to power a sub using an Alpine car amplifier? First thing is that the car amplifier runs off of DC power. It requires much more current than voltage. Meaning a simple 12V power supply commonly used for most small devices will not be enough to power your amp. Second thing is that...