I had a somewhat similar prob. I was out driving along the California coast in my 85 and it just died on me -at night - in the rain - over an hour & a half from home and 20 minutes from any civilization, oh yeah and no cell signal!! Voltage slowly dropped till the car just gave out. Thought it was the alt but got it checked out and it was fine. I cleaned-up some stuff a bit and check connections. So far no re-occurance, it's been a couple months.
If you have a local auto parts shop they might can test your alt for you before you shell out for a new one. Napa did it free for me. I woulndn't neccesarily trust the shop guys who sometimes just give the easy answer.
I just noticed your post's a month old so I'm guessing you got it figured out by now, but hey, maybe it's useful for someone else. B)
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