Is 14.8V alternator idle output voltage normal?

2011 HYUNDAI I20
50,000 MILES • 1.2L • 4 CYL • 2WD • MANUAL
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L TIATOM
  • MEMBER
  • 61 POSTS
I have 14.8V at idle on my vehicle listed above 1.2 Petrol India Version.
Even if I revs at about 1,500 RPMs, still it stays between 14.7 and 14.8V. I have no other issues. Everything solid okay.

But I'm worried if my idle alternator output voltage 14.8V is too high or not?
What's the acceptable voltage range for this particular car?
Jan 9, 2024 at 11:03 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

The voltage running should be around 14, so this appears to be fine. If it reaches 16v, then it will become a concern.

Take a look through this link that explains how to test an alternator. Take note of the voltages shown in the tests/videos.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know if this helps.

Take care,

Joe
Jan 9, 2024 at 1:15 PM
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