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SUPREME S21 User Manual

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General Care and Maintenance
11-5
ELECTRICAL SYSTEM
Before performing any work on the electrical system or battery, see Safety on
page 3-1 and 3-2.
Battery
Always turn off the battery switch (if equipped) or disconnect the negative battery
cable before servicing the electrical system.
When you install a battery:
Always use correct polarity when you connect the battery cables to the battery.
Make sure the battery terminals are clean.
Make sure the cable connections are tight.
Always shut down the engine before removing or attaching battery cables and
never run the engine with the battery cables disconnected.
Always remove the negative (-) cable first. Always attach the negative (-) cable
last.
Figure 11-2
Check the battery frequently for signs of corrosion. If corrosion is evident, clean
the terminal posts with a baking soda and water solution and a wire brush.
Disconnect the battery terminals before cleaning.
Check the fluid levels in the cells. NOTICE: Some batteries are sealed and cannot
be filled. A level of approximately 1/4 to 1/2 in. (6 to 13 mm) above the plates is
sufficient. If needed, fill with distilled water; do not overfill. WARNING! Lead-acid
battery fluid can cause severe burns.
KC-0151C-A
VENT CAP
MAXIMUM
LIQUID
LEVEL
MINIMUM
LIQUID
LEVEL
PLATES
TERMINAL
POST
VENT WELL
Supreme_2018.book Page 5 Wednesday, January 31, 2018 9:30 AM

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SUPREME S21 Specifications

General IconGeneral
Screen Size7 inches
BluetoothYes
CategoryBoat
SensorsGPS
Length21 feet
Max Horsepower300 HP

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