Have you tried the search function? Sounds like a bad diode in a relay, I just can't remember which one right now. I know these symptoms have been tossed out for discussion many times, always comes down to a bad relay. I'll try to remember which one...you try the search.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.