My 2000 75HP 4 stroke Merc stopped as I was heading back from crabbing last saturday. The enging was running at around 3000rpm when it stopped. The engine was smoking and there was a nasty electrical smell. Couldn't restart, no ignition, Power tilt or anything... dead as a doornail. Other electricals are fine. Can turn engine with manual rope so not seized up. Any clues?? Thanks folks!