Hello John,

True, the bench here is not perfect (and neither is the operator : )

Got your EC2 back today and have looked at it briefly.  Visual inspection showed that the input power filter choke was suspiciously dark in color.  Plugged the unit into the test bench and bench EM2 did indeed show NOP in the Tach window which means the EC2 is not responding to interrogation by the EM2.  No ignition or injection pulses from the EC2 at any rpm.   Found that there was no +5 voltage on board.  Cause was the input filter choke being open.   Replaced the choke and EC2 became fully operational. 

I must emphasize that the open choke was not an ordinary component failure.  It was burned open by an overload.  The overload was not caused by any problem in the EC2 so I have to conclude that it was caused by an external wiring error or abnormal electrical system voltage.  I know you have checked the wiring innumerable times but I can't draw any other conclusion.  Wish I could point to the specific area where the problem is but there are too many possibilities to make any reasonable guesses.  I'd fly down again to check it myself but things have backed up way too far here in my absence.

Tracy Crook