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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1503312" data-attributes="member: 29141">Blown resistor, I'm thinking. There should be a 400 or 500 ohm resistor connected in parallel if memory is correct. Could've got cooked or something.And I have another theory. Maybe it's slightly hair-brained but it's a shot in the dark.I'm basing this theory off of what I already know to be true because I saw it happen many years ago in the searing Italian summer heat:  copper.Copper expands very easily in the heat and I would repeatedly see copper contacts in high-amperage circuit breakers trip every single summer I was there. Quite possibly, the field current connection on the back of the alternator's rectifier plate got severed at some point by some means, and the only thing that reconnects it is the expansion of the copper plate back onto that wire connection. Maybe, maybe not.</blockquote>