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How to tell if a car audio capacitor is bad? Car audio system - 2 550 watt amplifiers, 2 10″ subs, 2 250 watt 6×9s, 1 .5 farad capacitor, upgraded battery and alternator. After installing the capacitor according to the manufacturer’s wiring diagram, I find that the car battery is draining while parked with the system turned off. The amps are powering off, the only apparent cause is the recently added capacitor. After removing the cap from the system, the battery drain appears to have stopped. Is this normal for a capacitor to drain the battery under these conditions, or could it be malfunctioning?

Sounds like the capaciter is doing its job, its charging from the battery, if its not fully charged before the car turns off, it will continue to take in electricity.. unless it has a bypass for when the car is off, some cheap ones dont

Tags: 2550 watt amplifiers, car audio capacitor, Car audio system