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Battery, though old is still holding a full charge. Alternator output just over 14v and smooth, consistent.
After thouroughly reading the Bentley manual, I went through all the electrical connections in the engine compartment. I jiggled the connection to the 15 Degree temp switch, and it solved the problem. It seems the connection - though it looked good - wasnt making enough of a connection possibly due to corrosion. With the headlights on, the slight extra load was enough to make the problem more evident.
To prove 100%, I disconnected the switch entirely, and it proved to exhibit the same oscillation.
Wow, what a small simple thing that drove me crazy for months. Hopefully this can help someone else in the future.
Thanks for all the suggestions.
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83 911 SC Coupe, Grand Prix White with Burgundy Leather
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