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Electrical System
Yamaha Secondary Charge Lead Circuit
Breakers
The secondary charge lead breakers provide sec-
ondary charging from the engines to the house
battery. These breakers protect the secondary
charge systems from an overload.
Notice:
Circuit protection for other engines, controls,
and steering systems may be dierent. Refer
to the engine owner’s manual for information
on circuit protection and amperage require-
ments for the engines and control systems
on your boat.
6.9 DC Power Management
Your boat is typically equipped with a full array of
electronics, fuel injected engines, stereo ampli-
er, spreader lights and could be equipped with
a Seakeeper or other accessories that consume
a signicant amount of DC electrical power. All
outboard engine charging systems are designed
to provide maximum electrical output at or above
cruising RPM. The electrical output from the charg-
ing system is considerably less at idle or trolling
speeds.
Depending on the optional equipment and elec-
tronics installed on your boat, there may be times
when the charging systems on your engines will
not be able to meet the DC electrical power de-
mand if to many accessories are activated while
the boat is operating at idle or trolling speeds.
Consequently, POWER MANAGEMENT PRACTICES
may need to observed at slow speeds, particularly
if your boat is equipped with a full electronics
package and a Seakeeper.
The house battery system is designed to provide
several hours of reserve capacity, which is ad-
equate for most situations. However, you should
be aware of the load each of your DC accessories
draw and make sure you don’t overload the capac-
ity of the charging system for extended periods
while operating the boat below cruising speed.
Always monitor the volt meters while operating at
slow speeds and turn o unnecessary equipment
that draw high amperage loads if the volt meters
indicate that the voltage in the batteries is below
12 volts. If necessary, reduce the electrical load
by turning o or alternating the use of high draw
DC accessories such as the Seakeeper, radar units,
stereo, spreader lights, etc.
If the house battery system that powers the
electronics and accessories on your boat be-
comes critically discharged while underway at
low speeds or trolling, make sure that you turn
o all unnecessary DC equipment and run the
boat engines at an RPM that will provide a read-
ing of the at least 13 volts on the volt meters to
recharge the house batteries. Proper DC power
management will prevent low voltage that can
cause critical navigation equipment to become
erratic or shutdown unexpectedly. Additionally,
sound power management practices increase the
life of your batteries and engine charging systems.
You should contact your dealer if you have any
questions regarding DC power management or
the DC electrical system on your boat.
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