OK, back to the drawing board. I took the charger off for two days and had a dead battery again. Jumped with pickup, turned it around, and put the charger back on.
Note a couple of things.
1. The engine symbol is on and the Sprinter dealer said it was because of two glow plugs not working. No problem as it still cranked and ran OK at the time.
2. Now I see the Brake light is on but not having any problem with brakes.
I'm not sure where to start trouble shooting except to loosen the Negative cable and check for sparks and removing one FUSE at a time.
Your thoughts please and note the dealer is too far away. My local Mechanic doesn't have the Mercedes codes in his OBDII tester.
Marvin