1994 Winnebago Vectra Diesel Pusher 12 V issues

Thank you kindly for all the comments! I was able to track the issue to battery disconnect relay located under hood electrical box. I have removed the relay and tested it and it behaves as it should. I am able to open it and close it and it holds the state even after the power is disconnected. This forces me to study the two purple cables that control this device. Anyone had any experience with those?