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GMC
C2500
Electrical
Alternator
Overcharging
overcharging
1989 GMC C2500
150,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
LARRY LAFRANK
MEMBER
1 POST
I've replaced the alternator, battery and ECM. It's still overcharging.
Dec 14, 2020 at 9:27 PM
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ASEMASTER6371
✓
Experienced Mechanic
52,796 POSTS
Good morning,
What is the charge rate?
There is no ECM involvement in this year. It is way too early.
It is all controlled by the alternator itself.
https://www.2carpros.com/articles/how-to-check-a-car-alternator
https://www.2carpros.com/articles/how-to-replace-an-alternator
Roy
Image (Click to enlarge)
Dec 14, 2020 at 10:50 PM
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