Radu - sorry, no idea. This is a problem I would go right to a reputable indy with, or consult via the various discussion boards - which you obviously are (but there are others...). All I can say is the intermittent nature of the problem would indicate a short of some kind. Or, god forbid, another bad harness. There are lots of 'replacement' harnesses that I'm told aren't much better. Good luck and keep us posted.

P.S. I'd sure be commuting in the diesel!