The correct voltage regulator should limit output to 14.2 volts. This voltage should be measured at the battery or the #2 terminal at the alternator. If the alternator has been replaced with one for automotive use it may have a 14.5 volt or 14.7 volt regulator installed.
Unplug the two wire connector at the alternator and connect the #2 wire to a grounded light bulb and check the voltage at the alternator end of the wire. Adding a small light bulb to this circuit while testing will insure that you will find a problem with a poor corrosion. If it is not within about .1 volts of battery voltage repair the wire between the alternator and #2 terminal at the alternator. That is the wire that the alternator uses to sense the voltage. If the wiring and connections are all good the problem is in the alternator, Almost guarantied to be the regulator.
This post was edited by Owen Aaland at 18:17:20 05/15/15.
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