Over time anything can wear out, even your starter. Just think of how many starting cycles you've had over the course of the lifetime of your vehicle. Every single time you start your vehicle your starter has to make that happen. Over a period of many years all that starting can cause the brushes inside of the starter to wear out and stop functioning. Sometimes it's a part that can be repaired and other times it just needs to be replaced -that just depends on the starter itself.
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