That is the whole point behind the ACC position. It supplies power to the radio and other devices but not the engine. If wired properly the ACC position will not supply power to the points so they are safe.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.
