Well...sort of. I will now refer back to tx1961 who is actually correct. The "missing ground" is actually back up through the harness to the neutral safety switch. If you took my suggestion and used a jumper, you bypassed the "missing ground" with your own ground right there at the solenoid. So to fix it right, you should figure out why you are not getting a good ground through the harness/neutral safety switch circuit.
By the way, this is very different from the more modern motors' wiring for this circuit
Good call tx1961.
