Y’all are not giving enough info. Do you have the currently standard system with the picture displayed on the center radio system and also includes the side view cameras activated by the turn signals? Is the current camera hardwired or wireless? And, is the wire to the camera permanent or detachable?
If it’s detachable then why are you trying to replace the wire. Just get a replacement camera and plug it in. The RVS camera is a pretty good and reliable system and unless you’re going to spend $7-800 for a true hi res camera you’re not going to get anything much better. The cable terminates under the driver side dash. It should be plugged into a RVS 501 switch box.
2018 Forester 3051S (aka Clyde)
2015 Wrangler Toad (aka Bonnie)
At some point during every day you suddenly realize nothing else productive is going to happen the rest of that day. For me, it usually occurs around 9 am.