Testing Ground Of South Bend 13 Lathe

I have a 1940, SB13, that I recently rewired from 440v to 220v.

While testing continuity and tracing wires, I testing the Green ground wire and found it does not create continuity to any part of the machine.

The wire is mounted inside the quick disconect mounting bolts. I don't get a tone even on the bolt it is attached to...

Should I move the ground mount to a different location?

or

Run a wire from the motor case to the ground on the power feed line?

toolman_ar