Accessory Connector on Steering Column

[roywetzel]

Will use this connector to power a 12V motor (ECC blender motor) under the dash.
Plan to use an inline fuse with the +12V wire to one motor terminal (via a switch).

I wonder what wire should be used for the other motor terminal?
Thinking two wires without separate ground is OK? Not sure about his though?

Anybody know what wire should be used for the second terminal?