I believe he misapplied the term. I think he meant he has the older factory Mopar alternator, with a "one wire" field
To the OP
"One wire" originally got started with Delco with built in, self exciting alternators. They are literally one wire. You ground (mount) it, and hook the output up. Nothing else. The regulator, and excitation, is all built in
They do have some both advantages and disadvantages.
