I think I understand what you are saying. Lets start by testing the battery and the alternator. If they are good, then we need to look at other options. Also, something as simple as a loose battery terminal or corrosion can cause electrical problems, so make sure to check them before you even remove the battery.
As far as the check engine light, lets see what the battery's condition is and go from there. You may need to have the computer scanned to identify trouble codes.
Let me know what you find.
Thursday, January 16th, 2014 AT 10:36 AM