I have a 2003 Ford Mustang GT, I had the battery tested and it will take a jump and start up so naturally I am thinking the alternator is bad. I take the alternator out and have it tested 3 times and it passes all 3 tests. At this point I take out all fuses underneath the hood to make sure there are no bad or blown fuses all look to be in working order. Terminals have been cleaned and new terminal connection have been installed recently.
I haven't driven the car in around 4 months so I thought the battery might be bad, but what has me stumped is the battery will take a jump and run for about 30 minutes then I can't start it again, like the alternator is not charging it but as stated above the alternator passed the test.
Is there anything I should look at before admitting defeat and taking it to a mechanic?
***UPDATE I had the battery on the trickle charger for around 24 hours now, but it doesn't event half enough power to work the locks, I am thinking a new battery is in order.