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One sign you might need new alternator brushes/voltage regulator is when your headlights run dim and the engine starts slowly, etc. This usually happens after about 100k-140k miles. Of course, you should check the condition of the battery, etc. If you need a new alternator voltage regulator/brushes this might save you some money. The brushes pictured here are sold for a 1985 VW rabbit but work perfectly in my 85-87 Saabs. You usually don't need a completely new alternator unless the bearings go bad.
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