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Alternator overcharging?

Tiny
KEN JOHNSON
  • MEMBER
  • 2002 GMC YUKON
  • 3.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 247,000 MILES
New battery and alternator and it's still showing on the dash 16 volts. Don't over 16 but does drop to 15.4 but goes right back to 16. Checked all cables look absolutely fine to me.
Tuesday, June 27th, 2023 AT 6:20 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
It could be the gauge but to be sure let's check the voltage at the battery when the engine is running.

This guide can help you:

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

Please go over this guide and get back to us.

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Tuesday, June 27th, 2023 AT 10:28 AM

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