The internal diodes are easy enough to check. While the engine is running, place a VOM in Volts AC across the battery terminals. It should be real low, less than 100mVAC. If you are getting 1VAC or higher then the diodes are suspect and will usually cause battery damage and the voltage regulator as well. Usually, you see a high DC charge voltage as well, when the rectifier diodes start to go bad.

As far as aftermarket diode packs, you might check with automotive electrical repair shops. They might sell you the diode packs. If you find one of these shops, it's just as easy to have them do the rebuild and I would have more confidence in their work than someone AZ uses. (After all, AZ is just looking for the lowest bidder with a reasonable amount of returns.)

From what you describe, I am still a little suspicious of the battery. It may have taken a charge but how low was it originally and how long will it hold that charge.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )