Disconnected the harness, still no reverse, sadly just like I expected.

The engine seems to have a load on it when in reverse, you can hear it drop in RPM slightly like it normally would so I know there is something going on in there. Hoping to get this nailed down before the weekend, if it needs to come back out I want to have it out and ready to go back in by the end of the weekend.... if I have time haha!