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One of our members here, sells a rebuild kit for around $45. CUCV Electric I doubt your your rotor is bad. It sounds like you have a bad diode(diode trio) or regulator. I'd rebuild it with his kit. This is something you can do at home with basic tools(you'll need and impact to get the...

Rebuild your passenger side alternator.

And for the third time. Test each battery with a digital volt meter, with it running and without and report back with the 4 voltages. The running voltage is critical to tell if you have an alternator issue.

How did you sense this? Telepathy or VOM? Test each battery with a digital volt meter, with it running and without and report back with the 4 voltages.

Since you have 2 batteries and 2 alternator, are you disconnecting 2 "neutrals? Test each battery with a digital volt meter, with it running and without and report back with the 4 voltages. Since you gave us no history on this truck, should we guess it is new to you, or it has been...