Oh yeah....that's the worst. I don't know it taking it in at that point will help or not, but I guess it couldn't hurt. He's right to check the wiring, because a short someplace could be doing it. it could also be the regulator/rectifier, but with being intermittent, I wouldn't think that's bad.
Is there any indication of it going down? Does the bike start sluggish a few days before or anything like that? Or is it just overnight?
He might consider getting some type of volt meter or indicator to put on it to monitor the condition during running.
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