lights dim and car wont start sometime

I have a 99 chevy malibu, and sometimes when i try to start my car it will like not start but the oil light i think it is and the battery light will only be on, and my dad said it was because i let my gas tank go dry, bc the light was on for gas, and then i refilled, and the tempeture dropped dramitcally, and there was moisture in the tank....so i went and bought dry gas to get the moisture out, and it didnt seem to work that well, so then i tried fuel injection cleaner or something like that, and then my car would start perfectly without having to do anything (before i would have to give it gas for the car to start and let the RPMs go to like 3000 and then hit the brake and it would start up) but now when it does start the lights like are really dim, and i have a system in my car with a amp hooked up to my battery, do you guys think that is the problem?

should i buy a compacitor to fix that or no?

please help me, i don't want to have to like buy a whole new car bc of this...

thanks guys.
Andy

geez, your post is hard to read...

your "system" is probably killing your battery; go have the battery tested for free in the parking lot at autozone, or advance auto parts... post the results

I'm sorry that it is hard to read, how is it hard to read?
is there any confusion, because i will explain it better.

I am going to have my battery tested later on tonight, i will let you know the results.

Thanks again.

i re-read your post:

ok so you let your car run out of gas....totally empty?!? cause your gas light went on?

i noted that you said your battery light went on as well...that's why i proposed to check your battery/load test on autozone for free...

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ok when you let the gas go empty, you also have a chance of clogging the fuel filter as well... all that sediment on the bottom of the tank may have gone through the 1st filter screen (that's attached to the bottom of the fuel pump/pickup) and clogged your in-line fuel filter

so that's another thing to look for; a quick change of the gas filter & see if this will relieve that problem...

The fuel filter is located on the underside of the vehicle, rearward of the fuel tank. There is no service interval for fuel filter replacement. The filter only is replaced if it becomes restricted.

that round small can is it...
http://econtent.autozone.com:24991/znetrgs/repair_guide_content/en_us/images/0900c152/80/09/13/49/small/0900c15280091349.jpg

autozone online has a good repair manual for free to help u go step-by-step in removing and replacing this thing

also, your fuel is the "coolant" for the in-tank fuel pump: i hope you didn't always let the gas level go below 1/4 tank all the time or else the fuelpump will prematurely die/burn out!!!!!!! that's your worse-case scenario

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as for your battery/stereo setup... any aftermarket setup will have a bigger parasitic draw... keeping your battery maintained, alternator & drive belt checked is one of the ways to counteract that...

ps autozone will also check your charging system to see if the alternator is not worn out as well.

a capacitor is for your BASS or subwoofer... it helps if you do play songs w/ alot of BOOM; your alternator will be working overtime :P