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I will answer myself if someone should have similar problems: The case is solved. Its not easy to find a wiring diagram for the 2.8 diesel but at last I found one. The three pins on the alternator stands for Dummy-LIN-Dummy so only the "LIN" should be connected. According to the wiring diagram there should be a wire between ECM pin #93 and the LIN connections with white/orange. Found the cable by the ECM but the other end is impossible to find if i dont remove a lot of things. Cut the wire and made a new cable to the alternator and works perfect!

Sorry but would suggest ECU has been electrocuted! - There is a feed to this that does not go via the ign switch i.e. live all the time.