Hi. New to the forum. I have a 2011 Dodge Durango 3.6 with 140000 miles. The other day the battery light came on. Was able to get it home before it died. Removed the alternator had it tested. It tested bad. Got a new one and put it in. Car was hard to start but finally got it started. Removed the jumper cables and car died. Sounds like the new alternator is not working. It will not jump off. Not sure why I am having a hard time jumping it off. Should I go ahead and get new battery? Thanks.