so the story begins as i come back to my car after a minute fo going to the bank and the car didnt start, didnt make one sound except a single tick when trying to start the car. had the car jumped turned the car off later when driivng for about 20 min. so i take the car to auto zone after jumping it for the second time and cheked the battery said it was good, get it jumped a third time from auto zone to my mechanic he checks the car says the battery the altenator all work perfectly fine. car turned on fine when i went back to the mechanic a cuple hours later.

I have two diamond audio d6 12 inches in the trunk witha battery capacitor just in case that makes a differnce.

 

What happened when you tried to start the car?(hesitates, hard to crank. ect)
Do you have a meter available?

 

i dont knwo what a meter is? and im tellin not one hesitation or sound

 

Only thing I could think of is that your caps are charging and discharging... thus draining your perfectly fine battery, try disconnecting your caps and see what happense. Possible the caps are just being drained and thus are drawing power from the battery.

 

I meant a ammeter or voltmeter.
How are the battery terminals? Loose, corroded?

 

Two things come to mind here:

1. You have a corroded connection on your battery or starter.

2. You have your aftermarket stereo equipment powered directly off the battery and not through the car's fusebox/electrical system which uses load detection to tell the alternator how much voltage and current to produce to run and charge your system.

If issue #1: disconnect and sand/clean ALL start related power/ground connections.

If issue #2: disconnect from battery and find available fuse location in fuse panel to add fused connection for your aftermarket subs and stuff. This way the component load is detected by the system and your alt. charges your battery to meet the demand.