Brunswick 750 IMPACT, Operation & Maintenance Manual

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5-5
Electrical Systems Section 5
Charging
The outboard engine alternators charge the three bat-
teries when the engines are running above idle speed.
The batteries are charged through a marine-grade bat-
tery charge isolator, which allows the outboard engine
alternators to charge the starting batteries and the
house battery. All batteries are charged when the out-
board engines are running above idle speed, regard-
less of battery OFF-ON switch position.
The battery charge isolator output circuits are pro-
tected by three 70-amp push-button circuit breakers
located inside the control console.
The charge isolator also prevents a higher-charged
battery
1
from discharging into a lower-charged bat-
tery
2
by keeping the batteries electrically isolated.
If a battery fails to accept a charge from the engine
alternators, check the following items before replacing
the battery:
• Check the three 70-amp push-button circuit
breakers
• Check for unexpected current draw from boat
electrical devices
• Check the engine alternators following the engine
manufacturer’s instructions
• Check for loose, corroded, or damaged wiring
Your boat might be equipped with an integral three-
bank battery charger that charges all batteries when
the charger is connected to a 115 VAC GFCI power
source. All batteries are charged when the battery
charger is active, regardless of battery OFF-ON switch
positions.
The AC battery charger output circuits are protected
by three 40-amp push-button circuit breakers located
inside the control console.