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Depends on when you're seeing what.
If you're stopped waiting at a light, at idle, foot on the brake, blower on, headlights on, and such, I'll see 11s. If I'm over 2000rpm driving with no extra electrical load, coming off a cold start, I'll see 14.5. I think it's normal.
If you're parked just watching your voltage, no changes to engine speed or electrical loads, and your voltage is bouncing from 12-14v quickly, then I'd say there's a problem, likely w/ the alternator, or connections to alternator or battery
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