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I wouldn't spend a dime to fix the 100a alternator. They were grossly undersized for the application. Any money spent toward the charging system should go toward upgrading it to the 260a alternator or one of the other options that are out there - the 200a HMMWV alternator, or a commercial 24v...
If you have 28v at the regulator E terminal and the 28v LED is off that points to a bad regulator according to the Niehoff troubleshooting docs:
https://www.ceniehoff.com/Documents/Ctrl_Hyperlink/TG14_uid252021119472.pdf
Pretty common failure item on the 100a alternators.
14v is pulled from the center of the 28v windings so in general you can't have 14v if the alternator isn't making 28v. Where are you testing the 28v from?
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