I have a 2009 avenger 2.4L . My car was doing great but I’ve been having to jump start it lately . Every time I flipped it my key , it would make a shaky sound but still start but now it won’t come on. I got a new battery in it , it fixed the problem for the week and now we’re back with the same problem. I took the battery to get checked and they say it’s a good battery and it could be either my starter or alternator . I personally think it’s my starter , but would like to confirm it before I spend more money.