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Then you have the adv charging box.

Do you have batt cutoff relays in or next to the battery box?

On the a1 with advanced charging and the battery cutoff solenoids you want to keep the original system in place. Theres a reason for the whole setup. Unplug the mil connector from the box under the spare tire see what happens. And check all your batt connections make sure everything is clean and...

See if your truck has the advanced polarity protection box. It will be under the spare tire. This interacts with the alt regulator and regulates battery charging. Sometimes this box starts going bad causing issues like you are having. The double alt thing is not compatible with your truck if you...