Quote:
Originally Posted by Kanoe
Correct me if I am wrong here. Won't bad brushes (not charging) cause the alt light to come on? I can't imagine it wouldn't. What did you see? I've had it happen in a corolla and the light does come on in that case.
I'm thinking if you have an alternator die and not see the alt light on the dash then you have bigger problems than brushes.
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My 2001 4Runner experienced the brush failure. My wife was DD of that. According to her, there was a day or two of sluggish starting. Then the next day, it failed while she was driving. Had to replace the alternator because nobody carries brushes. I removed them to check, and they were worn badly - one was at about 1/16” or so. She said the battery/alt lights came on only as it was dying.
What I assume was a regulator failure happened on my son’s 2009 Corolla, and it was a hard failure with dash lights and everything. First symptom of that WAS dash lights. Brushes were nearly new.
So to answer your question, maybe it’s because a brush failure isn’t like flipping a switch, since it happens gradually as contact is lost. There would still be some measure of charging until there wasn’t. I don’t know at what point the car is supposed to declare a charging problem.
With your Corolla, did the brushes fail, or do you know?
