wiring on a swap

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i am trying the finish up my swap (it is taking forever) and i am doing the wiring.
when i pulled off the tape there was another wire rapped aroung it. and that was conected to a groung.
now it wasn't conected to the knock sensor wire it was just wrapped aroung it(bare wire)
i didn't know how important it was to have that one there. maybe for.......i dont know. any help
 
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