Problem solved. My electrician was smart. He said that even though you're showing a ground, that doesn't mean it's the same ground. I learned that the chassis ground and neutral get tied together at your main panel. Mine was not but getting ground from the pipe in the ground over that 150ft run. The charger must be testing for continuity between neutral and chassis ground. We used a spare wire to ground all the way back to the panel chassis and it worked. He'll put in a dedicated outlet for me (so I'll have 20a) later this week. I can't install a 240v but I'll be ok. I'd like to get a spare 110v Level 1 charger so I can leave one set up in the garage and the original one be my portable. They aren't as prevalent as the 240v Level 2 ones and not cheap either.