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Sounds like the capacitor is loading up the battery. Perhaps you could put a relay in to open-up the connection to the capacitor when the radio is off or when the car is off? Just put a large relay to break the (+) connection.
hi there installing a capacitor is at your own risk as they charge up and hold a lot of power if hooked up wrong can give you the shock of your life and blow your sterio and computers to bits i learnt my lesson any way remember to take off positve before installing here is a diagram how to install it,,,, ok the positive goes to the battery and the amp on one side and the other to ground .....take a look at this easy to use diagram i found for you hope all goes well http://www.caraudiohelp.com/images/car_audio_capacitor_installation.gif
The 1 farad capacitor is something added to current hungry systems to help keep the supply voltage at the proper operating level.
If your amp does not work after putting one in your system, but it worked before you put it in, you most likely have it installed wrong.
The capacitor should be put in parallel with the main +B voltage of the amplifier. That means you would connect the positive side of the capacitor to the +B voltage supply of the amplifier and the negative side of the capacitor would go to the chassis ground.
If you have it connected in series, or inline with the +B voltage supply, the capacitor would be blocking the voltage to the amplifier.
Without more information on your problem that is the best answer I can give you.
If this does not help, please supply more information and I will be happy to help you further.
Disconnect all speaker wires from the speaker terminals of the amp and disconnect the RCAs. Replace the 30 amp fuse with a 15 amp fuse. If you turn it on and it blows the fuse, it's likely that it has shorted output transistors. If that's the case, you need to have the amp repaired.