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It's a complicated answer, as there is no real set in stone replacement interval. You can easily TEST your alternator whenever you want, using a simple $2 voltmeter. The volt reading on your car battery should go up by about 1-2 volts from when the car is not running, to when it is idling, this is one sign that the alternator is working and charging the battery.
For much more details, see the related link. This link also describes a different way to test your alternator.
For what its worth, I have a 2000 echo with over 170,000 miles on it, and the original alternator is still working fine. I've also only had to replace the car battery one time.
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∙ 14y ago
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how to replace alternator on Toyota 4 runner 1996
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take it to the Toyota dealership and ask them to replace it
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See related answers, its already been answered
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