assuming you mean there's also a "left" position that's 'off' I think someone may have changed the switch to a later year or to a car switch, I believe you should have a 2 position switch, off > on, no 3rd position
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics