my headlights dim wen I turn on my ac heat or radiator fan..but wen none of tht is goin there fine..wen I give it gas the get brighter but I was hoping that if I upgrade the big 3 everything will be fine...
I like to sit wit my car off n listen to music n I have a sy stem it's 1 12in punch and I have my in line fuse as well but 4 sum reason it drain my better completely the other day..so I'm goin to upgrade the big 3 and get a new battery..I've replaced the alternator with the same one tht was replaced...my system power is running from my battery not my alternator..so wen I get a new battery should I get a bigger 1 than the little 1 tht originally comes in my car????

ive never had this problem in any of my other vehicles and they all had bigger systems than wat I have nw...

 

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2000 civic ex