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Is this a common occurrence? Is there something I can do to prevent having to shell out $100 every 3 months?


Yup, this is about par for the course... or you can keep out of the mud/water!

Most part stores offering reman'd alternators give you a limit lifetime warrenty (ie, a single replacement throughout its life)... so, take advantage of this and you'll only be paying $100 for every other one.

-Rob