Ronmar
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Where were those voltages measured at? If at the batteries, thats not bad, but I would also compare with voltages directly at the alternator terminals. That is where the regulator regulates the voltage to. They put a lot of connections on these trucks When they incorporated the polarity box/lbcd. They are also out in the weather between spare and air filter. If it is an A0, there are also extra connections on the ground path, as they put an instrunment shunt(measures current flow) in the ground path back to the batteries also out in the weather near the polarity protection box. Corroded connections there are a very common issue And could easilly cost you a tenth or so if any current is flowing thru the wire… y9u need to lower the spare and crawl in there to access them…