I'm trying to wire up Hitachi internal regulated alternator upgraded on my 1971 240Z and the wires listed on a post on this site list a yellow, white, black, black with white stripe and white with black stripe wires. My wires are yellow, white, black, white with black stripe and white with blue stripe. In the post it says to connect the black with white stripe to the white with black stripe. I'm wondering if mine should be the white with black to the white with blue stripe or which wire to connect. Any help is appreciated.

After 39 years the pigments in wire insulation will change subtly. White wires turn yellow and black wires fade. The White with a blue stripe you describe almost has to have been originally white with a black stripe. There is no white/blue wire on the alternator shown in the factory service manual.

I went back and read the instructions again and the wires mentioned were the wires on the engine harness side and not the wires from the voltage regulator (color part). Once I followed the instructions everything worked just as it should. I did however order the plug an play fix from MSA and it is the simple solution as well as much cleaner look.

You did the smart thing, reddie73.