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OK, mine has black wire going down under throttle body towards the motor/starter and also splits off and is grounded to body on radiator support. Both are black. Based on OP pic, not sure what black/red wire is. Looks like the black one going to negative battery terminal is same one going down under throttle body towards motor/starter on mine. I do not know if wire also going to OP radiator support (body ground) being missing is an issue or that black/red wire that has come off negative battery terminal or both. I would undo battery terminal and reconnect the black/red wire in it and also add ground wire going from negative terminal to body.
 

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Best pic I have on hand.....you can see in bottom right corner, one cable going down under air intake/TB and the other side going to the body behind headlight housing bolt............

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