Do you have a test light or volt meter?
Start by confirming you have 12v into the ignition switch.
The good news it that it is a basic problem.
And even a corroded connection would "probably" let the dash lights come on.
If your parking light lights dont work, it is definetely a 12v source problem.
Check the chassis disconnect switch (if you have one).
The more chassis stuff that does not work means the problem is closer to the main 12v supply from the chassis battery
2014 40QBH Phaeton DP Cummins 380HP ISL, Freightliner XC, 2019 Jeep Grand Cherokee Trailhawk TOAD
Blue Ox Aventa tow bar, SMI Air Force One -Cave Creek, AZ.