According to the symbol conventions used in that diagram, they are all ending in female spade connectors. Is that true? If so, they may be test connectors, or accessible Ground connectors, used in troubleshooting, but that is my educated guess. Tracing them around the circuit, some do appear to connect to Chassis Ground. Make sure they all connect to Chassis Ground,
in the diagram, before Grounding them! You can also try using a Digital Volt Meter's Continuity Test, to see if they all currently connect to Ground (assumes their wiring is good),
before you replace them. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII