Cub61,
I had a very similar problem under very similar conditions. Really. What it wound up being was corrosion at the positive side where a side mount cable was cut and a new end placed on it. And at both ends of the negative cable.
I was glad to have it fixed. I had to do it in the rain. But I was honked-off too because last year I had a new battery installed. There was no way that much corrosion developed in a year. So the good people who charged me $110.00 for a battery never cleaned the cables.
I felt like going back there and asking them if cleaning and tightening terminal cables was extra. Don't assume someone who should have done something did it. Good luck with your search.
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