Brunswick 750 IMPACT, Operation & Maintenance Manual

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2-13
Boat Operation Section 2
Water Pressure Gauge
The water pressure gauge displays the pressure in the
engine’s cooling system. The gauge’s unit of measure
is pounds per square inch (PSI).
The water pressure gauge is a good indicator of cool-
ing system condition. Notice the readings at various
engine RPM and watch for any variation.
Refer to the engine operator’s manual for PSI ranges
for your engine.
Voltmeter
Each outboard engine has an alternator that charges
its starting battery when the engine is running above
idle speed. The voltmeter displays engine battery volt-
age measured in DC volts (VDC).
These readings indicate that engine battery systems
are in good condition:
• Key OFF: 0 volts
• Key ON, engine not running: 12 volts
• Engine running above idle: 14½ volts
Refer to the engine operator’s manual for additional
detailed information about the engine charging sys-
tems.
!
CAUTION
If the water pressure reading drops significantly
while the boat is on plane, stop the boat
immediately. Check the engine’s water intakes
and cooling system. If the engine is
overheating, continued operation could cause
extensive damage.