Sometimes is something simple
 

OK, so I took the cart for little ride hoping that maybe decharging the batteries a bit might make the charger kick on again.
It didn't but the little dashboard gauge showed it pretty well charged so I decided to check the electrolytes.
They weren't good but as I was doing it, I bumped some wires connected to the terminal of the back passenger side battery and it sparked. I jiggled the wire a bit and noticed the the nut was loose. I tightened up the nut, plugged it back in and it's charging and has been charging for over and hour.
The terminal has three wires connected to it and I'm guessing that one of them has to do with the OBC. At least I hoping that's all it is.

Sounds like you have hit the jackpot, now remember every month to clean and check all wires and battery cables for looseness.
If you check these things you will prevent most of electric issues in your cart.
Good luck.