Bad alternator???

[RBSilvy85]

Some of you might remmber my post aboit a month ago with problems unlocking and locking my truck with my key fob. That has still been an off and on issue where i hit unlock it unlocks and it locks immediately back up. I also had a new battery I installed last Nov die back in June. Advance auto tested battery and deemed it bad so they gave me a new battery under warranty. Fast forward tonight im driving and I notice truck is idling rough and lights are dimming. I assume my alternator is actually goin back causing these problems I have had. Is there a sure fire way to test my alternator to see if it is failing?

[HeySkippyDog]

They can bench-test an alternator at Autozone/Advance Auto/Discount Auto.

Take the alternator off, take it to the store, they can find out.

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[HeySkippyDog]

If it is a bad alternator, at least those are easy to change out.

I would NOT buy one at an auto parts store, however. I would buy another AC Delco/GM alternator. I've been bit by the reman/Chinese parts too many times to bother with anything but OEM.

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[RBSilvy85]

19 minutes ago, HeySkippyDog said:

If it is a bad alternator, at least those are easy to change out.

I would NOT buy one at an auto parts store, however. I would buy another AC Delco/GM alternator. I've been bit by the reman/Chinese parts too many times to bother with anything but OEM.

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No I've been there before. My 03 Dilverado alternator went bad around the this same mileage (60k) and I had reman put in but from the start it didn't seem right. I could feel it bog down when I braked but then would recover. It lasted maybe a year and then I had to replace it with a new Ac delco. I plan on buying a AC delco from rock auto if this one is bad.

[HeySkippyDog]

60k seems early, I've never had one croak that early, across several generations of GM trucks.

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[CCGMC]

Ya 60k is early. I’ve owned several GM trucks and they have gone out around 130k miles or so. I have an Escalade right now with the original alternator at 189k.