Karl - I’ve successfully ruined Delco and Mopar (Chrysler) alternators by disconnecting the battery while running – no reason to think it will not smoke a Motorcraft alternator too(!)
A possible solution is to provide a dash switch wired into the alternator field circuit. The driver would open this switch and leave it open during the tech inspection. The alternator will thus be “turned off” (not providing current) and therefore unable to provide a burst of voltage and destroy itself in response to the sudden open circuit when the inspector pulls the battery disconnect.
A side benefit is the driver can leave switch off - thus the alternator disabled - during the run. Depending on the car's electrical load this might yield an additional 1 HP or so at the rear wheels during a run.
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