can't say for sure, but usually the motor is insulated from ground by rubber mountings, I think black would be ground .... one rev only would likely be park, you may have a single speed motor
"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
