Freightliner cascadia not cranking and starting Mcm Cpc Tcm not connecting with computer

2015 Freightliner cascadia , when plug in computer to diagnose fault codes , it doesn’t show any mcm cpc and tcm connected to computer, checked battery wiring and fuses than I end up finding bad wiring on Sam cab plug x19 . Tried yo bypass the starter relay it start the truck but truck shutdown even you turn key off , so had to fix it properly for customer. But if you oh v stuck somewhere you can pass the relay that shown in video with loop wire to make to your destination and fix it than . Hopefully they might save your day for someone. Have great holidays be safe everyone