Alternator Overcharging problem

[Azzkikrcuda]

I am working on upgrading the electrical system on my 70 Cuda. I replaced the stock externally regulated alternator with a new internally regulated nippendenso from an 85 to mid 90s toyota 4runner. The alternator has 4 hook-ups battery, Sense, Lamp and Ignition. I ran a new 8ga battery wire to the battery. Ran a 10ga sense wire to the starter relay terminal. Capped off the lamp wire. Ran a switched 12 wire to the ignition terminal. When I start the car and check voltage I get between 14.9 and 19volts constantly changing. I took it to Napa and had them check the alternator, it put out a steady 14.5 on there machine. I rechecked my wiring it looks ok. Any suggestions would be appreciated.