I have a 2003 1500 hemi. I've changed the alternator and battery, as I was told by a mechanic. But the battery gauge is still showing no power, and more than 15 minutes on the road proves a fatal mistake. I've had the battery and alternator tested, both good. I can't find any obvious ware or shortis in the pigtail or negative to the alternator, but somehow it's still not charging. Any thoughts or experience would be super helpful. Thanks.