check charging system is on? a couple days ago i connected my battery the wrong way the minus to the red cable.. and then i put it the right way in like 20 minutes or so the charging system light came on. and it shut off my radio and everything else was dying. so i changed my alternator and put a new battery.and when i started my 2006 taures it still showed check charging system on my dash. what is it that is the problem?