67 Barracuda Reverse Lights

Okay so I decided to run a hot wire around the car back to the reverse lights to see if they were operational. It turns out that one lit right up and the other has a ground problem. Plan is to fix the ground then check continuity between the reverse lights and the shifter switch. Will just run a new wire if needed, then run the other end of the shifter switch to a piggy back off a fuse that is hot with ignition on.