The external regulator had a white/black, black, white, yellow, and solid green. I have already followed the steps shown on atlantic z by connecting the white wire with the yellow wire. I now just need a wire that I can connect to the white/black wire coming from the L of the alternator. The write up says to connect it to the green/red wire that is supposed to be in the plug that goes to the old voltage regulator but I guess the 75 models did not have the green/red wire. So I am looking for an alternative at the moment.