It is an Advent OGM1 system.
I took a look at the wiring from the camera, "upriver" today. At the camera, the wiring seems to be firmly connected and no signs of wear, corrosion or other issues. I followed, and inspected, the wiring from the camera for about 5 or 6 feet and everything also looks OK. When I initially wired things, I went a bit overboard and taped everything as well as covered the wiring with two layers of split corrugated loom tubing, so it has been well protected and looks almost new.
As I indicated earlier, I am an electrical amateur and unsure how to determine if power, or a signal is present along the wiring route.
Marv