He said it’s idoling too low to keep the battery charged up. There are lots of reason that could happen. Of course without seeing it he didn’t know what. He said it’s small possibility it could be the alternator but he didn’t think so. Hubby took the van to a parts store that will check the starter, alternator, and battery for free. If those all check out, it’s off the the mechanic is will go. Please pray it’s an easy and cheap fix.