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TurnerFam · 01-05-2019, 02:37 PM

One question to ask is about the type of lighting - are the cargo lights the typical covered 'bulb' lights, while the interior lights are mostly all LED style?
If so, what you may be experiencing is low House battery levels, which may be enough to drive the lower-wattage LED interior lights, but adding all of the cargo lights, at the same time, draws too much. The LEDs may continue to work, but not the cargo lights. Different types, different reaction to low battery levels.

I just went thru this on my coach, as the Inverter started to mysteriously just 'shut off', for no reason. LOW BATTERY cell levels in one of the four House batteries was the culprit. Adding 'one more' draw thru the inverter, with the low battery cells, was just 'too much' and the Inverter would sense 'low voltage', if even for a fraction of a second, and shut down.
Very aggravating, because 12v lights would work, though the 'flickering' when this happened led me to the ultimate problem - the batteries.

as for 'where' the fuse panel is:
my guess is that your 12v fuses ARE close to your 120v Electrical panel, though they may be hiding nearby, such as behind a panel, since the two are closely related.

I've delivered coaches like the Venetian, Aria, Palazzo, Berkshire, Pace Arrows, and others and see that these electrical panels can be in various and out-of-the-way hard to find places - at the end of bed platforms, within cabinets in the master bedroom(usually the lower cabinets), in a upper cabinet in the rear or mid bath, on the wall in the hallway, in an outside bay near the Inverter, etc.

My Palazzo's Main Electrical Panel and Fuse Panel are next to each other at the foot of the base of the bed... not the easiest place to get to as the door for the Main Panel rotates UP, rather than down, making it a 'get down on your knees with a flashlight' scenario, especially since no ceiling lights shine down on this area effectively.
Some have the fuses integrated within the same Main Electrical Panel box, but other motorhomes, like ours, with 'whole house' inverters, and no typical Converter, generally don't. They are in separate panels, and may be located away from each other, if for no other reason than engineering logistics, but are generally close to each other for wiring close proximity purposes.