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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