Welcome to the forum.
Do you know what your 12v system voltage is?
Are you plugged into shore power and have you converter/charger turned on?
Those are the things I'd start with.
A digital voltmeter could help you troubleshoot your problem.
Sherm & Terry w/rescue Eydie (min Schnauzer) & Charley (std Poodle)
2015 Jay Flight 27RLS, GY Endurance (E), Days: 102 '15, 90 '16, 80 '17, 161 '18, 365 '20
2006 Ford F350 PSD, 4WD, CC, LB, SRW, Cmpr. pkg, Equal-i-zer 4-p, ContiTrac TR
Full timing: Some will think you're crazy, some will be envious, just enjoy the freedom!