Many converters will provide 12 volts DC without a battery.
You should have 120 volt outlets. Use a proven good device such as a 120 volt drill or light to insure you have 120 volts to the rig.
Locate your 120 volt AC panelinsure all breakers are turned on. I would suggest turning them all off, applying light pressure toward offthen turn them on one at a time.
Locate the 12 volt DC panel. Many rigshave them behind a small plate held on by thumb screw adjacent to the 120 volt circuit breakers. Test using a 12 volt test lamp or volt meter to verify.
Locate your converter and post make and model.
You didn't say what year. This sheet shows rig has 45 amp converter.
Lance specs and other info.