Regal 53 SC Owner's Manual page 217

Chapter 5
CHARGING SYSTEM
The alternator produces DC current to charge up the bat-
teries while the vessel is cruising. The Cummins alterna-
tors are solid state construction with an output of 135
amps per alternator. They are self-excited which means
that current output is triggered at lower idling rpm's. Pe-
riodically check the belt tension and adjust as necessary.
CAUTION
!
TO AVOID POSSIBLE ALTERNATOR DAMAGE
NEVER TURN OFF A BATTERY
SWITCH WITH THE ENGINE RUNNING.
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