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.