The possibility that the belt is loose is usually judged. But if you say it's not loose, it could also be tight or the generator is low on oil, or the generator is low on oil. the belt tensioner lacks oil. I think I should change the belt first. Even if it's not the belt, it doesn't matter. You can save it for next time and you will not lose it, because the belt is a wearing part and must be replaced after a certain level of use.
Questions About Automotive Generator Noise
Introduction Regarding the problem of car alternator noise, the possibility that the belt is very loud. Generally, the belt is considered loose, but if you say it is not loose, it could also be tight or the alternator is short. oil, or the belt