If your battery is not charging, and you get a light that says battery is not charging. You may want to check your (generator / alternator) as they are one of the same and the issue usually points to the car part known as a generator or could also be called an alternator
Use this video to show you how to remove the Alternator from a Hummer H2. This video will also show you how to install one as well.
Please be sure to see the entire movie before attempting the project and by no means do I or any of my affiliates assume any liability should the viewer have mechanical or other problems due to misunderstandings or likewise.
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Nice…I'm going to try replacing mine here soon. Thanks for the video.