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Old 01-09-2024, 02:43 PM   #2
340Cuda
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Join Date: Apr 2003
Location: Tulsa, Oklahoma
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Default Re: Alternator problem on 2021 GMC Terrain

I am no GM tech but my street car always shows high 13 or even low 14 volt readings even with seat heaters on. You voltage reading seem way too low for a working alternator.

Kind of a long shot but have you had the battery checked?

Maybe a wiring harness problem passed were they were checking the alternator?

Hope you figure it out!
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