The new regulator should have 2 wires. There should be a yellow for VAC and a red wire for VDC. There are some models out there that have 2 separate regulators, not just 2 of them built into one. What year classic did you get that regulator out of? I looked at my service manual(I don't have e-start) and it has one main regulator on the schematic. It has the optional e-start in there. Another wire coming out of that. Of course it would be a different part for that though.