There is one more item you may want to look at. I had the same problem, and found that my fuse in the fuse block was not making a good contact. The fuseholder in the block was somewhat corroded, and the fuse was making kind of an intermittent contact. I cleaned the contacts, and the problem was solved. I, too, had been through all the ground situations, with limited result, changed the alternator and regulator, etc.But the fuse fixed it. Best of luck. Decco.
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