txj2go
Well-Known Member
I did the same disconnection as the video shows at 3:20- remove the bigger nut and the first cable comes off, the cable with a simple loop connector on its end. What remains on the battery is another cable with a rectangular piece on its end. The rectangular piece has a hole in it that fits over another stud off of the batter terminal and has a stud for connection of the second cable. You can take the first cable off and leave the second cable connected, but you can't do the reverse. IOW once you take the second cable off you have no cables remaining connected. My vehicle doesn't have anything electrical added so there are only the 2 cables connected to the negative terminal. At 3:26 in the video you can see the elaborate connector piece that remains on the battery when you take the first wire off. The one that goes to the body ground would be the only remaining path for electricity back to the battery.I admit that it is hard for me to follow your description of that connected to the main battery's negative terminal, and thus to comment on it. Perhaps things have changed since this video I link below was released, but I've queued it to the point that details the cable in need of temporary disconnection, in order for you to see if your 2018 has the flash we discussed in previous posts on this thread.
I can speculate about the second ground you mentioned from the body- vehicles that have completely separate frame (not unibody) usually have body mounted to frame with rubber bushings so there isn't a direct electrical connection between body and frame so they have to provide a wire from body to frame. Likewise most engines are mounted through rubber and don't have a direct connection so there is another wire to the engine to ground it. If the hot wire from the battery goes to the starter, and the ground wire from the battery goes to the body, the electricity needs a path from body to frame to engine. Older cars usually connected battery direct to engine and had secondary connection from engine to body. Newer cars have so much electrical inside the body that they do it differently.
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