CHARGING SYSTEM - 4C-2190-823225--1 1096
Battery Isolators
Dual Battery Charging Systems
Using a Battery Isolator
Battery isolators allow the addition of an auxiliary
(second) battery to the MerCruiser electrical system.
The auxiliary battery is primarily used as a power
source for various accessories installed on the boat.
The battery isolator will allow the alternator to charge
both the cranking and auxiliary batteries at the same
time while preventing accessories, connected to the
auxiliary battery, from drawing power from the crank-
ing battery.
Mercury Marine does not manufacture any battery
isolator systems. Battery isolators must be bought
from an outside manufacturer. Mercury Marine sug-
gests following the manufacturer’s instructions care-
fully.
IMPORTANT: Alternators used on MerCruiser en-
gines ARE NOT equipped with an isolation diode.
!
CAUTION
Follow battery isolator manufacturer’s instruc-
tions for wire gauge. Battery isolator installation
must conform to BIA Low Voltage Wiring Stan-
dard No. 125-79.
NOTE: MerCruiser engines equipped with a 3-wire,
belt driven alternator, can use a battery isolator.
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