[GROOVY2]

found this while researching alternators-

this was on a sales site for high output alternators -

Is this correct ? -

High Voltage Diodes
We all know that opening the battery selector switch under Load
can blow up alternators, regulators, and attached electronics. --?

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An optional snubber can be purchased to help prevent such disasters. We use 200 Volt diodes in the alternators to help avoid meltdown if the switch is opened. Other manufacturers use only 100 Volt diodes ... a certain failure if the battery switch is opened while the engine is running.

 

[Budsky]

I've heard for many years losing the battery connection with the engine running, essentially the same thing, can blow up stuff.
A proper battery selector switch is a make before break type- that will prevent this.