what a lot of bull for a simple problem, remove 3 pin plug & test for battery voltage with TEST LAMP, if present give other two wires a HARD pull & most likely one will come free, never fails. only other problem ive come across is when unit has been reconned new regulator pins are slimmer than originals thus giving poor connection. you,ll be a brave man if you consider your WAVE FORMS are correct & tell customer ecu is faulty.