i have a sub with a mono amp + a capacitor. my battery keeps on dying out on me after a couple days(2-3) w/o driving my car. I ended getting a new red top battery and it is still doing that if i don't drive my car for a couple days. do i need a alternator PLZ HELP!!!!
IF SO WHAT BRAND OR WHAT KIND OF ALTERNATOR SHOULD I GET???
THANKS IN ADVANCE!!!

 

If you haven't drive the car at all and it still died out on you, that means something is draining your battery somehow because you didn't even use the car and your stereo. You might not need a new alternator, but definately have to check where the drain it. You might have something grounded.

 

yea i believe the capacitor is draining out battery
does anyone know if theres anything i can plug in my wall socket to keep my battery charged while parked in the garage?
thanks

 

A battery charger is not going to solve your problem. It will just shorten the life span of the battery if you keep charging it. Try disconnecting the stiffening cap or take the fuse out of the amp for a few days to find your problem. Also make sure that the cap is connected correctly. My guess is the cap is hooked up wrong. good luck.

 

Get a multimeter that can read in milliamps. Disconnect your negative terminal and put the multimeter in series between the negative wire and the negative terminal. The current draw should be 60 mA or less. If your battery is dying after a few days, the draw is probably quite high.

Start pulling a fuse or disconnecting a stereo component one at a time. See if the reading drops. If nothing happens, plug it back in and move onto the next one. Eventually you'll pull one that stops the excessive draw. That identifies the item that is causing your battery to die.

I had to do this on my Ford truck. The fuel pump relay stuck closed and my fuel pump ran all night, which killed the battery. I replaced the relay and the problem hasn't come back since.

 

Yeah, that's not your alternator. You probably have some parasitic drain going on somewhere. If your system has a custom harness, make sure it's not using any energy when the ignition is off.

 

thanks guys ill check it out

 

^What he said.