I have an 05 f150 w/4.6 and I dont know if this has anything to do with each other but I just recently put in an aftermarket stereo and it works just fine. That's not the issue. The issue I'm having is after the installation I start it and it's like it was before but when I turn it off it's like the starter engages for a split second. could something have been connected wrong or is there some wire that connects to the stereo that would make the starter engage at shut off?