It gives and example of GS1100E grounding on the side plate. The side plate/solenoid bracket is basically the system ground because the R/R is mounted to it and grounded to it. There is a B/W wire from the harness going to the same ground plate at the solenoid bolt.
This is the reason I pull all those grounds together and put them oat a common point usually the R/R mounting bolt. I use that bolt (vs. the solenoid bolt) because the R/R ground is more important (to charging) than the solenoid ground (only used to activate the starter)
However if you don't have the solenoid bracket grounded one way or another (which seems to be your problem) the solenoid and in turn the starter will not activate.

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