Initial advice was that the sparker insulation had deteriorated allowing the spark to be grounded within the burner and not the outside where the gas was flowing.
With some effort, I was able to remove the burner as the instructional video did not match the construction of my Jenn-AIre cook top. Had to take apart the burner insert. Replaced the igniter and still no spark.
Further examination (using my electrical experience), I concluded that the problem was too much "crude" under the burner had formed an insulation to the igniter grounding (there was no wired ground to the igniter). I cleaned up the "crude," cleaned the screws providing mechanical connections for the interior metal providing the mechanical ground.
After the cleaning and reassembly, the spark igniter finally worked.
A reader here might conclude that the purchase of a new igniter was not needed, but the years of sparking had begun to wear down the depth of the insulation on the sparker and now, with the new igniter, the insulation is now new. Glad I replace the igniter.