How do you know when to change an alternator for a 2002 Toyota seqouia?

You should consider changing the alternator in a 2002 Toyota Sequoia if you notice symptoms such as dimming or flickering headlights, electrical issues with accessories, or a warning light on the dashboard indicating charging system problems. Additionally, if you hear unusual noises like grinding or whining from the alternator, or if the battery frequently dies despite being new, it may indicate that the alternator is failing. Regular testing of the charging system can also help determine its condition.