Oh, tii style. make sense. Anyway, belt tension is OK, not super tight but I have to remove the battery to really get at it. I'd have expected loose belt to show different symptoms. Belt doesnt seem to be glazed This is a brief flash, any RPM, not at idle. Temps OK in mid 80s weather. Can't see any wiring issues. I called the place that inspected the alternator last year and he said maybe early signs of brushes are going. Guess I'll haul it in there.