ASP

My issue started about a month ago when I helped my friend jump his car. I was driving home and a message appeared "convenience functions currently unavailable". I drove home the light went away, 5 minutes later drove to the store and the message appeared again. I opened the trunk took everything out and found the + terminal had came loose so I re-attached it and the problem went away. A few days later my front left headlight stopped turning on when I would start my car and threw an error code but started up fine by it self within 15-20 sec. It didn't bother me much so I didn't put the two issues together. Also for the past month my car just doesn't feel the same I feel horrible lag from the transmission and the engine and about a week ago threw 5 codes which were 3 cylinders misfiring and a p0505, cleared it and no issues again. Today I drove to the store parked my car saw I was sticking out too far started my car within 20 sec and the red battery light came on. I put the car in dyno mode to monitor voltage on my drive home which was at 13.4-13.2 all the way home. I've replaced both the battery's and alternator about 1 year ago. I am stuck as to what else it can be? could I have fried my alternator when the + terminal came off and cause all of these issues?

TTMotorsports

The voltage from the alternator might be fine but the amperage is too low. Take a meter reading from the alternator and test for amperage.

Any shock, like jumping another car, can cause undue stress on the charging system and possibly cause an issue. Anything is possible. Good luck.

turbo97se

A visit to local Autozone or Checker/O'Reilly should be able to do a test like this for you. They would do a load test for current

I had loss of convenience functions too, battery was replaced only a year ago ... turned out to be only a loose battery terminal. For you it could be terminals on the alternator too.

ASP

So I went ahead warrantied my alternator now charging at a steady 14.2 volts! problem solved