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Message: <blockquote data-quote="Tirefryr" data-source="post: 1598955" data-attributes="member: 550281">Any good service shop should have the proper equipment and know-how.  Avoid taking it into Autozone or the likes.  If you want to do a half-assed type check yourself real quick, bust out your multimeter, and check the voltage at the battery.  Then fire the vehicle up and measure it at idle.  Then turn on as many accessories as you can and take another voltage reading.  You should be between 11.8 and 12.5V with the vehicle off, and between 13.5 and 14.9 volts with it running and with the accessories on.  If you are below these voltages or above, you have a problem.Like I said though, it's probably the reg.  We replace them all the time.  I'll check for any TSBs tomorrow.  I believe GM did a recall on the alts already, but I may be wrong.</blockquote>

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