By the term cover, do you mean the top enclosure of the battery box that contains lead acid battery/ies? If so, that cover is meant to seal the box with the attached tubing to vent hydrogen gas out the front vent of the rig. If you don't keep it in place, then you have an explosion risk due to any electrical arcing that might take place in that front area. Better to rework the whole system so that is stays sealed and yet can be remove to check water levels...or...switch to agm batteries that are sealed, requiring no water additions or venting.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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