You do not wan,t any resistance in the main bat. term. wire. A fuseable link is desired. For a resister in the exiter circuit I use an ignition resister. They are cheap & easily obtained.The voltage sensing wire does not have to be as heavy gauge as the main bat wire. The preferred way is like you discribe but I run it right off the bat term on the alt. Many cars come that way including Cadillacs.
