Regal 53 SC Owner's Manual page 70

REMOTE BATTERY SWITCH
As part of the battery management system remote battery
switches are located in the engine room.
A remote battery switch is wired between each engine
and the "on-off " universal battery switches located at the
battery management system panel. See the illustration.
Their purpose is to break up the long battery cable runs
from the batteries to the management center panel. Also,
they offer a shorter run from the battery to the starter
motor. In addition, the remote battery switch from the bilge
(sump) provides an avenue to shut down the battery system
during engine or sump routine maintenance functions.
Remote battery circuits normally feature 150 volt breaker
protection.
Each remote battery switch provides a continuous rating
of 300 amps DC and a cranking rating of 1250 amps DC.
Both remote battery switches are "in line" between each
cranking battery and the engine. The "house" battery does
not employ a remote battery switch.
NOTICE
IF THE REMOTE BATTERY SWITCH
POSITION IS CHANGED IT MUST BE
REPOSITIONED BY PUSHING THE
MAGNETIC LATCH DOWN TO REACTIVATE
THE REMOTE BATTERY SWITCH
OR THE ENGINE WILL NOT CRANK.
THIS MAY NEED TO BE PERFORMED AFTER
PERIODIC MAINTENANCE SCHEDULES
WHEN THE REMOTE BATTERY SWITCH IS
TEMPORARILY DISABLED.
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Chapter 4