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Section 8
ENGINE EXHAUST SYSTEM
The engine exhaust system vents engine exhaust gases away from the boat.
Inboard engines may use mufflers and/or seawater to cool part of the exhaust
system. Do not make changes or modifications to the exhaust system. See the
Engine Operator's Manual for engine exhaust system and service information.
ENGINE LUBRICATION SYSTEM
Inboard engines, like automotive engines, use a sump system where the engine
oil is contained in the engine. See the Engine Operator's Manual for engine oil
recommendations and service information.
ELECTRICAL SYSTEM
DC System
Most boats use a 12-volt common negative ground DC system. DC systems are
usually the primary electric supply for lights, pumps, blowers, engine starting, etc.
One battery is required at minimum for engine starting and accessory power.
Multiple-battery systems consist of a primary engine starting battery and
additional batteries that supply additional power to DC electrical accessory
circuits.
Battery switches control battery power distribution and disconnect the batteries
from the boat's electrical system. The engine's charging system charges batteries
connected to the charging system when the engines are running.
Battery isolators prevent accessory loads and other batteries from depleting
power from charged batteries. Isolators also allow the engine's charging system to
isolate the alternator charging output and distribute the charge among all batteries
according to individual need.
Where applicable, a main DC control panel may feature a voltmeter, battery test
switch, fuses, circuit breakers and a master breaker switch. WARNING! Never
reset a breaker that has been automatically tripped without first identifying
and correcting the cause of the problem. A fire could result. See Safety
Precautions at the beginning of this section for more details.
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