OK, Thinking-Cap Time...

nrp wrote:
Jay - If you get desperate, you might be able to create this problem on
the ground using a hand held or jury rigged electric motor to spin the
alternator rather than having to run the engine. This would allow
better diagnostic capability using an oscilloscope.

If you try this, keep a fan blowing on the alternator. Even in cold
temperatures, it will need cooling air.

George Patterson
If a tank is out of ammunition, what you have is a sixty ton portable
radio.