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IF you are still using Original - "Notch" denotes Positive.
Opposite corner denotes NEGATIVE
Between the Notch, opposite corner - is AC Input.
To Verify?
Start at Notch - Place POSITIVE Test lead there.
Then "test" to all other points using Negative Lead.
"any Open"? Might mean "wrong +" at start, which means the test failed.
Wanted to mention - and look carefully - at your photo.
Please advise me to what is a good replacement mic for my SR-497HPC... Answer: 497 is "wired like Cobra", so many choices available. That radio does not need a power mic, so purchase a stock "coffin style" mic with a decent cord, like the ones that Astatic uses. The Superstar DM-507 is my go-to. https://www.ebay.com/itm/3050474478...adANq91JSiEEnz8EGqPJRBloTgEyaVsBoCtoMQAvD_BwE $12.99 + .99 cent shipping.
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