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Removed alternator, sprayed brake cleaner inside and out.blew it out with air reinstalled it. works fine. charging at 14.5 volts .dont know how long it will last????? Do you?

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    Was there an issue with it to begin with? And, with a fix like this, it could last 20 minutes or 20 years, there's no telling. Oct 12 '15 at 16:20
  • Question certainly needs more detail, but I attempted an answer anyway.
    – JPhi1618
    Oct 12 '15 at 20:19
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I think the only thing that cleaning an alternator could fix would be a stuck "brush". A brush is a common part of an electric motor (or alternator) that wears down over time. They normally have a spring that holds tension on them as they wear. If the brushes were "stuck", the alternator would stop charging. If this is what happened, it should keep working for a long time - until the brushes stick again or fail completely.

Of course since you removed and replaced it, the problem could have just been a bad connection.

Motor bushes with springs: enter image description here

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