So I tried installing a grounding kit myself. Everything was going smoothly until the first ground point. I forgot about the fact that I live in the rust belt and the Bolton screw that grounds that small cable snapped. I tried making cuts in it to attempt to get it out via flathead but no success. So basically what I did was attach a ground cable from the negative terminal and attached it to that small cable that was previously grounded to the frame and wrapped it in electrical tape.

My question is: Is this still a ground? Nothing bad should happen right?

I’ll probably take it to a shop and get them to extract my mess.

Hooked up a cable that runs from the battery negative terminal straight thru to the spot

Photo of where the small ground wire was originally grounded. Red circle is the screw that snapped on me.

I hooked the small ground wire up to the purple wire and screwed them together. Finished it up by wrapping in electrical tape just for safety measures

 

That should still work as long as the tape hold it together.

Those plastic nipple caps cover threaded holes too so pull them and find one with thread and use that one. It'll avoid bringing it into the shop.

FYI our cars bring a electronical load sensor in the ground wire. This determines battery discharge.

In theory grounds from battery negative that dont pass through this sensor will trick the computer to slow down the charging of the alternator however there is about 50% of people that have not had this problem.
The 370z which shares a lot of components, in some years this sensor was not included so keep this in mind.

If it indeed does "something" it could point to OEM negative wire deterioration. The OEM wire looks small and fragile however internally it would be the size of a 5AWG ( metric cable). So it good shape it should perform as intended.

Common failures are at the terminal.

 

Thanks for the reply. I actually got a self taping screw and drilled a hole right next to the old ground point. So everything is back to normal.