The OP has a Leece Neville J180 mounting
T R U C K
alternator. The 79000 series ADJUSTABLE voltage regulator CAN NOT BE ADJUSTED HIGHER THAN 14.8 VOLTS.
Someone had better re-check their facts. NO and I mean ZERO NONE alternator voltage regulator regulates at 15.0 volts or even 14.8 volts. The lone exception was the 15SI Delco 1116405 voltage regulator which had a setpoint of 15.0 volts at 20c. It was soon obsoleted when lawsuits hit Delco. The idiots designed the reg for use with it's proprietary Calcium Calcium Delco battery which cost almost twice as much as an aftermarket non calcium battery and was inferior in all respects except cranking CCA. This regulator boiled regular batteries dry. The class action lawsuit was filed in Lansing, Michigan in 1979.
Few if any of today's integral or ECU voltage regulators are not "temperature compensated". This is acheived by placing a THERMISTOR within the voltage regulator voltage divider voltage sense network.
At 70F, the maximum deviation allowable is in the neighborhood of 14.2-14.3 volts which soon slumps because of coolant radiator BTU emission, or stator/rectifier thermal buildup OR engine radiant heat. Today it is not uncommon to see voltages of 13.7 - 13.8 when the engine is warm. Starting an engine on Christmas Eve on the North Slope of Alaska, the thermistor allows a regulated voltage peak in excess of 15.0 volts.
I was fascinated by the performance of my MoPar ECU controlled voltage regulator near Lukeville AZ on the 10th of August 2010. At 122F ambient temp, with an engine temp of 242F, the regulation setpoint backed off to 13.18 volts.
REGARDLESS
There are no, none, zero, absence, of alternator voltage regulators that at 70F regulate at 14.9 - 15.2 volts. Please recheck facts.
