454cid
Sooper Pooper
If you mean a cs130 or an ad230 kind of alternator, most GM stock applications do not use the wire for sense unless the battery is remotely placed, in my experience, or the cable itself is just really long from alternator to charge point.
For example my buick park avenue did not use the sense wire because it was a short run to the box and battery, but a buick lesabre of 2000-2005 does because its under the back seat.
No, I'm talking 1960's 10DN applications being retrofitted with a 12SI. Your point is exactly what I find to be interesting. In the 60's voltage was an issue that needed to be solved, but later in the 90's and early 2000's it either wasn't an issue, or was solved differently. It could be the machanical regulators of the 60's were the issue, as I don't know when the wiring changed from the horn relay being the main distribution point. It might have been in the 70's with the introduction of the 10SI that was internally regulated.