Thank You all for your help!
Here is a retrospective of the problem that will save y'all, but at MY experience and expense.
As you recall, the 7510 died between mows, as my wife shut it down for a bit.
In retrospect, here is my account of piecing together the pieces of the electronic puzzle.
My original dynamo failed on delivery and I purchased an OEM alternator from one of this sites sponsors and the dealer installed with out labor charges inlieu of labor to replace the part. No transport charges where ever waived.
After shutting down the tractor, upon an attempted restart, only the Right (light/light) and
Left Glow-Plug lights would come on, and all I could here was a "Click,"which I attributed to the starter selenoid, b