wiring harness

that means i will need a new harness under hood....

No it doesn't. You need to "ohm it out" (check continuity) and read the diagrams and figure out the difference. IT IS EASY to release the connector terminals, pull them out and "repin" the harness. You might not be able to "fix" everything that way, you may have to cut/ splice in the harness in one or two circuits.