I just bought a new powermaster 100amp and I want to run it as a 3 wire set up, my car is a 67 acadian and has the stock external regulated 37 amp alt. with the power wire from the horn relay and the white and blue wire from the voltage reg. I know to connect the red to the white and the brown to the blue wires from the external reg. Then do I run the blue and white wires that went to the alt. before to the new alt., if so the plug in that I have from stock is different from the plug in on the new alt. can I just cut off that plug and put on the rght one? If so does it matter which wire goes to which spade on the new alt.? Thanks for any help.