Thank you all, and thanks to the hundreds who were about to send suggestions.
A cable from battery positive to the block resulted in instant cure. For
various reasons, I settled for a 12-guage wire from the firewall, which
works perfectly. Careful examination reveals no other connection between
motor and ground.
Why did it work until 2 days ago? The only simultaneous event was the
breaking of a tail-pipe; perhaps there was some grounding through the
exhaust system.
One last favor: Please don't tell anyone about this, as I am infamous for
telling anyone with a starting problem to put in a good ground strap. When
they say that wouldn't help a dead battery or seized motor, I always tell
them "Well, it wouldn't hurt!"
. . . and again thanks.
Larry
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