If I can remember, I will check the wiring diagram at work. Some KQs have a little branch lead off that main battery earth terminal, under the seat, it connects via a bullet or spade to another thin black/white lead. This may be the one for the frame earths.

 

Checked the diagram, my book is for the 700 but 750 to 2018 was almost the same electrically and the frame earths are fed via that little black/white. Have a post 2018 power steering 500KQ in at the moment, the black/white wire is thicker and doesn't seem to have a spade connector, so straight from terminal into loom, but otherwise the same.

 

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