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Old June 12th, 2018, 21:58   #3
Vince Waldon
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Join Date: Apr 2009
Location: Edmonton Alberta Canada

Yes, if you're only getting 12.5V as a system voltage with the engine running the charging system has quit.

You can remove the regulator/brush assembly with the alternator still in the car... worth a check to see if the issue is simply worn brushes. They are a wear item and pretty common point of failure.

That said, good idea to check the slip rings too if you find short brushes... if the rings are deeply grooved as well no sense buying a new regulator/brushes; you'll want to spend that money on an entire alternator.
Vince Waldon Edmonton AB Canada

Note: The above is to the best of my knowledge- but at the end of the day simply interweb opinion, worth EXACTLY what you paid for it, and if used done so at your own risk.
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