Referring to a 72 S Targa: What should the correct behavior be regarding the dash seatbelt light and any audio sound. I.e., Should the dash light be lit ONLY when someone (enough weight) is sitting in either of the seats without his-her seatbelt buckled? Then, should the light go out after that person buckles-up? for 1972, should there also be a buzzer sounding when weight is applied -- until the belt is buckled? Or, other behavior?

Wen I am seated in the driver's seat currently, with belt buckled, the red dash light remains on, even with no one in the passenger seat. No buzzer sounding, regardless.

Thanks.