D16a9 in a 94 Civic Sedan. Been having a lot of issues and the other day I noticed a single wire coming out of the wiring loom. I have zero idea how to identify what it is and where it should go. Pictures below.

 

Follow it into the cabin. I’m sure it leads to the ECU. That’s a wire someone ran

Fix the wires at the battery terminal. **** looks ghetto as hell.