The pictured wire with terminals appears to be the auxiliary ground wire for a 1970 A-body, connecting between the blower motor mounting stud and the wiper motor mounting stud. If the pictured wire and terminals is ~16 inches long, and has part number 2857741 (unless worn away), it is the described auxiliary ground.
The following images from my 1970 Duster show the 2857741 strap installed. Note the studs used for its reach, and the stud on the wiper motor has the small ground tab/strap.
The 2857741 ground strap is similar to, but longer than, the steering column grounding strap. It is also a heavier gauge wire. The steering column grounding strap, part number 2983794 is ~6 inches long. The following image shows the two ground straps compared:
View attachment 1716469689
The following images show the 2983794 steering column grounding strap installed in my 1970 Duster and my 1973 Duster: