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Did someone do this and is it dangerous to drive the car can it start a fire? The only other thing I can think of is the reflective thermal shield on the hood heating it up
that's the negative side, your chassis is negative (ground)
if it was the positive side (covered by the plastic cap to avoid contact with the chassis) I would be worried.
Honestly, can't tell if that was made with a mechanical means or if it is melted by an electrical short. might have been someone "testing" charge by shorting the battery poles if it was a short...