Posted by Owen Aaland on October 10, 2015 at 17:39:35 from (209.105.17.213):
17.2 volts is too high. That voltage will cause the battery to boil. 14.5 volts should be the upper limit, 14.2 would be better for Ag equipment use.
Measure the voltage when running at the battery. If the at the battery is less than 14.5 it may indicate a weak or dead battery and the alternator has to raise its output voltage that high trying to get the battery to the proper voltage. If that is the case do not expect a new alternator to last very long. They have a short life when continually running at maximum output.
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