After a week of voltage testing, I can find nothing wrong. The voltage measured from the led counter shows a steady 13.6 to 14.2 VDC. At idle with the lights on it still reads at 13.6. Driving at different speeds changes nothing. I have a VERY stable charging/battery system.
The couple of times that I caught it going into "limp home" I could see no difference although I thought I saw a reading of 14.8 once.
So apparently erratic voltages are NOT the source of my strange problem.
You guys are welcome to jump right in with suggestions.
Anziani