Non AC blower motor ground?

Murray said
Wrong! The brown ground wire is a very long one and attaches to screw at the heater core clamp and then continues over to the right kick pad for a real ground.

@Murray - think you might be thinking of another A body? @Dana67Dart & @CFD244 this is a 71 Demon heater box and no way the stock wiring is reaching the right kick panel. The stock wiring is just long enough to get to where it was originally and confirmed above by @CFD244