So I have a 02 WRX and replaced a bad battery about a little over a year ago. About six months ago I noticed that when I would unlock the car after sitting for several hours, the chirp would sound sort of sad like it didn't quite have full power. But I never had any other problems so I just ignored it. Now just in the past 2 months it started to have trouble starting sometimes. Initially when it was really really hot out, and only about once every three weeks. The first few times i just opened the hood and let it cool down and it would start again. But recently it doesn't start on its own at all any more. When you turn the key to the on position all the dash lights and everything come on so it gets some power at least. It does start when you jump it, and then runs fine as long as it stays on.
Because of this I don't think its an alternator problem, but I'm not certain. I pulled the starter and bench tested it and it works fine. The fact that it jumps leads me to believe battery again, but I'm worried that something is maybe causing the battery to drain ever so slowly, or its just not charging the battery when its running. Anyone have any ideas? Ignition maybe? Thanks so much!