The battery charger on my Open Range 5th wheel went bad and I replaced it with a
Boondocker converter Very satisfied with both product and seller. that vehicle stays plugged in 7x24 all its life.
But signature makes me think you have a 2018?
Reset the GFI outlet. on my AF its on an outlet below the sink (press test, then reset).
Check the AC breaker for charger in the breaker box. move it all the way to off side, than reset it to on side.
plug something else into the outlet the charger is plugged into, does the outlet have AC?
Check the 2 fuses on the back side of the charger, then can blow if wires are crossed.
on my 990 the charger is below that folding top on the step up to the bed, on LS. its a big silver box that probably says progressive dynamics on it. It has 2 heavy 12V wires going to it (white and black, where black is positive). it also will have an AC cord coming out that has a 15a plug on end that plugs into an outlet down inside step.