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Replaced battery

Hey so I was having problems with what I thought was my battery. The first day this problem started it was 100 degrees out and my car had trouble starting. This continued for about a week, my car would start fine if it wasn't hot but would have trouble when it was hot from being i'n the sun. I assumed that this was my battery.

So I finally got around to switching today because I was busy with school and got a little sick.

But when I took out the old batter the green yellow black indicator which say if the battery doesn't have a charge or needs to be replaced. My old battery says that it's just not charged.

I also could not find a manufacture date on the battery but there is an 08 written i'n pen which I'm assuming is the date it was installed.

What I am really worried about is that my problem is not i'n fact my battery, but that it's not being charged.

If you guys could please help me diagnose this problem and make sure everything is fine with my car I would really appreciate it.

Thanks
Aron

Quote:

Originally Posted by Thefancybum (Post 767998)

What engine do you have ? when you say it wouldnt start do you mean the engine wouldnt turn over or turned over but wouldnt fire ?

I have a 3.0 and the engine would turn, it just wouldn't fire. It was definetly something with my battery. I'm just not sure of the batteries dead or it's just not getting charged anymore. Also since I replaced the battery, the 4x4 alert is on my daahboard

Is that 3.0l petrol ?

Have yoy got a volt meter? if so put it across the battery with the engine off then again whilst its running, this will tell you if its charging or not. But you do say that it turns over but not start which would not indicate the battery i wouldnt of thought. Maybe a stupid question but have you tried another Key.

If the engine was turning over the battery was doing its job... it not firing off may be a different problem all together. I'd suspect fuel pressure bleeding down as a possibility as well as possibly a weak cam or crank sensor.

Well then I was wrong, it didn't turn at all. Eitherway the problem is definetly something to do with the battery. I just don't know whether that battery was dead or the car wasn't charging it.

Oh, so it didn't turn over? In post 3 you said it turned but didn't fire... Short trip city driving with AC on high can bring the charge level down over time. I see BMW's with all city miles go 2-3 years per battery while long rural/highway driving cars can go 4-5 years per battery... Speaking very generally of course.

I also have subs on a capacitor, which could kill the battery. But the meter on the battery was black which means it wasn't charged. Could the meter be wrong and the battery can't hold a charge?