The black wire from the top coil mounting bolt is the "ground". It travels to the shorting bar that is press fit into the red kill switch assembly. The blue wire comes from coil spade terminal, positive or hot, and runs through the black heat shrink tubing that insulates the female spade terminal that goes on the that shorting bar. Blue is not hooked to black here. Blue continues over to the red switch body and terminates into an uninsulated flag terminal, slid in sideways to red switch body. 2 separate wires from coil connections to kill switch assembly.