In the primary ignition circuit the negative terminal on the coil is connected to?

In the primary ignition circuit, the negative terminal on the ignition coil is typically connected to the ignition control module or the ignition points in older systems. This connection allows for the grounding of the coil, which helps to create the magnetic field necessary for the coil to build up voltage. When the ignition control module or points open, the magnetic field collapses, inducing a high voltage in the secondary winding of the coil, which then sparks at the spark plug.