New Voltage Regulator at 15V?

Its a wee bit high for this time of year but see if it comes down after it warms up.
I don't know what's going on but it does seem like some of the electronic VRs are set higher than typical stock or run high for the first few minutes.
The other thing thats real important to check is for a voltage drop.
Take the voltmeter and measure the difference in voltage between the alternator output and the regulator control wire (usually blue). Could check it at the ballast resistor or the alternator - should be the same in both places. I assume this is a ground regulated alternator (regulator has the triangular plug, each alternator brush has a wire connection to the regualtor).