Howard, It will have to remain a mystery. Why? Everything works now. Starter. Blinkers. Starter with key off or on, as before. The spare starter I had rebuilt is the original 1940. The starter in the car is most likely a '47, but I can't read the plate. So maybe that added to the confusion.
I did a practice removal on the spare starter before attempting the one on the Duchess.
To remove the relay cover takes 5 screws: 1 on the back of the cover, the 2 small terminals at the top in the front, and 2 small screws on the bottom front. The one closest to the engine was a bear. First you have to remove the copper plate/strap to the starter from the large main terminal closest to the engine. Then to get that screw I lifted off the distributor cap. That gave my screwdriver a straight shot at it.
After disconnecting the wires, the cover, which has big holes that slip over the top of the big terminals, came off.
This exposed the contacts. I cleaned them. With the cover off I reconnected the wires, connected the battery and Bingo, starter turned over.
I think my somewhat loose starter button burned the contacts somehow. But gee what a thrill. And I didn't have to remove the starter.
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