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If the voltage is high its usually the regulator thats bad. Its on the back and of the alternator and can be replaced without removing the alternator. There are 2 different types and they are not interchangeable. Alternators that say hellas greece and then everything else.

In the area of the air tank drains but in and under a bit. Common failure item.

Probably the ppv on the truck freezing up. See if the horn and wipers work when it's building over pressure. The governor is past the ppv so if it's frozen then the governor can't do its job. Will