that dont look like a ground wire, just looks like a solonoid and spark wires.
atm ours are black with red caps (seperate solonoids for each spark plug) this looks like it replaces those with blue wires.
terminology is wrong (not a mechanic) but you open the hood and you will see what im talking about.
and of course i could totally be off my rocker, but thats what it looks like to me. as far as MZ stated, yup thats all true. but what it looks like to me, is what i described