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would this work to polish my acc brackets as well as my alternator??/

Take a DA with 80 grit and start sanding the texture out. I did this for a small amount of time then went to 180 and then 320, using the 320 for most of the time.
Next I used an electric type DA with a polishing pad and a tough grit polish. If you don't use something like a dual sander you'll probably end up with swirl marks in the aluminum.
You can polish up any cast aluminum on the truck this way and the longer you polish the better it looks. I just spent about 40 minutes on the alternator minus taping it off and painting it. I also did the idler and it looks awesome!

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