That's what I meant there regulated through ecm. Well I already did it, I put the salvaged alternator in.Wow. Are you sure you should be doing this yourself?
Cars haven't had external voltage regulators since the late 60's, early 70's.
Voltage regulators were built into the alternator when car manufacturers stopped using generators, back in the 60's.
Some new cars don't even have regulators built into the alternator anymore. A lot of modern cars are now regulated through the ECM.