Join Date: Jun 2006
Location: The Berwyn mountains in the paradise of Powys
My Motorhome: Hymer S740 on Sprinter 616 (2004)
Thanked 338 Times in 308 Posts
Did the lights go off with the ignition before? Until say the early 90s most cars and vans were not ignition dependent for lights. My 2004 MB Sprinter wasn't and I would often leave my headlights on dip in countries that required daylight driving lights. Twice I stopped for lunch and a kip and ran the battery flat. In the end I made the front fogs as ignition dependent DRLs.
Have you checked fuses re wipers, then try a multi meter (you will need one in a camper).