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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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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