That was pretty much my game plan, although the fusable links are not something I'd typically look at unless it simply went dead.

I connected the DVM to a hot lead (the emergency brake wire) and monitored while I went Yard sailing today. the lights flashed monumentally 2-3 times adn when I caught the drop it was to like 2-3V. no miss and the engine just hummed. Very off.

I suspect the alternator I believe the PO said it had been replaced, but with what...

As you said, diagnostics; and make sure all connection are "Clean Bright and Tight"

So the answer is: a wild fluctuation of voltage DOES cause the warning lights to flash on.

Is that intended by Toyota?