Regal 53 SC Owner's Manual page 76

The battery charger features a LED multicolor display.
Different LED colors and combinations have different
meanings. Combination of the current display (A) with
the load bar shows the percentage of maximum current,
of the total banks. Combination of (V) with the load bar
shows the actual charging voltage.
This charger is protected against overload, short circuit,
over heating and under or over voltage. If a fault condition
occurs, a load bar segment on the display illuminates red.
The LED position indicates the failure which the cause
can be found in the charger operator's manual.
Note that this battery charger normally feeds both engine
cranking AGM batteries but should these batteries be fully
charged the VSR's can close and the house battery could
recieve residual charge current through this charger.
CHARGEMASTER BATTERY CHARGER DISPLAY
For the charger to function the battery charger breaker on
the main AC ship's panel must be activated.
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Chapter 4