Ok...I am trying to reactivate this dead thread.

On my 05 E53 I have replaced my Battery as part of regular maintenance about 2 months ago. It was over 3 yrs old.

I have since replaced Crankcase housing and Oil filter housing gaskets. Everything worked out perfect. A month and half after the above jobs the Battery warning light comes on intermittently. The night before I drove while there a heavy poring rain. I checked the under the engine for the plastic oil catch and metal plate. Looked OK except on the metal one there were two opening. Not sure if it is like that or or Inde idiot that worked on my X5 forgot to put it back or worse STOLE it. Sorry for being mean.

So my question is due to the rain and condition below the engine contributed possibly for the alternator or the voltage regulator going bad?

Your thoughts appreciated.