GL Class (X164) 2007-2012: GL320CDI, GL420CDI, GL450, GL550

Questions on alternator voltage

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Old 09-09-2016, 07:33 AM
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2008 gl320cdi
Questions on alternator voltage

I have the truck back from the dealer. So far so good except for an issue with fog lights. I don't think they completed a thorough inspection so I will bring to another mechanic.

My my question is what should the voltage read as car is running. I have a brake controller which displays the voltage. It used to read higher in the 14's. Now it's high 13's to low14's.

Thanks.
Old 09-09-2016, 09:07 AM
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'08 GL 320 CDI
That sounds about right.
Old 09-09-2016, 11:12 AM
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Originally Posted by DennisG01
That sounds about right.
this.

ideally you want just over 14 vdc

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