alternator overcharging?

2002 GMC YUKON
247,000 MILES • 3.8L • V8 • 4WD • AUTOMATIC
Avatar
KEN JOHNSON
  • MEMBER
  • 1 POST
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.
Jun 26, 2023 at 11:20 PM
Avatar
STRAILER
  • ✓Experienced Mechanic
  • 55,554 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.

Jun 27, 2023 at 3:28 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle