Medic4622

Please bear with me on this on.

A4 Avant 2011 B8

4 weeks ago heavy rain 60 mph complete electrical failure, restored a few seconds later. several seconds later same thing. No electrics at all, no lights on the dash, car didnt stop or stall. stopped took 5/6 attempts to get the fob out and stop the car. Put fob back in and all was normal. drove for a while no issues. same thing happened briefly the following day and no issues since. This week got a battery light in and 'Alternator Failure battery not charging' Stopped the car restarted and after a few seconds the same problem. Drove to my usual mechanic (he is an ex audi guy) he says the battery isn't charging so assumed the alternator was at fault. New alternator fitted and the same problem is there. He has tried various components and nothing even got a new loom that runs between the alternator and the starter and same fault. anyone have any ideas. Nothing on the diagnostics??