Sea Ray 390 Sundancer, Owner'S Manual

Page: 117 / 184

6.15
S
ECTION
6 • E
LECTRICAL
S
YSTEM
390 Sundancer ® ( 425 Sundancer ® )
Replace zinc anodes if they are corroded 50% or
more.
! CAUTION
Zinc anodes generally require replacement
about once a year. (In salt water areas, replace
every six (6) months). The need to replace anodes
more frequently may indicate a stray current
problem within the boat or at the slip or mooring. If
zinc anodes do not need replacing after one year,
they may not be providing proper protection. Loose
anodes or low-grade zinc may be the problem.
When an AC shore power system is connected to
the boat, the underwater metal fittings will, in effect,
be connected through the water to grounded metals
ashore. The zincs will be consumed at a faster rate
unless the marina maintains a protective system to
prevent this. In this case, hanging a zinc in the water
bonded to the metal outlet box on the dock will
reduce zinc loss on the boat. DO NOT connect this
zinc to the boat’s ground system.
It is extremely impor tant that all electrically
operated DC equipment and accessories be wired
so that the ground polarity of each device is the
same as that of the battery. Sea Ray
®
boats have
a negative ground system, which is the
recommended practice throughout the marine
industry. All metal items (fuel tanks, underwater
gear, etc.) in the boat are connected to the zinc
anode by the green bonding wire.
Electrolytic corrosion can also be caused by “stray
currents” due to a fault in an electrical item, even
though correctly grounded.
A. G
ALVANIC
I
SOLATOR
Galvanic current isolators (zinc saver) located on
the starboard bulkhead behind the Main Distribution
Panels are installed between the shore power
ground and the boat’s AC ground connection to the
DC bonding system. This connection maintains the
safety ground from dockside power while stopping
the back-flow of DC corrosive currents. The galvanic
isolator can be accessed lowering the Main
Distribution Panel / DC Distribution Panel assembly
in the salon.
18. AC & DC E
LECTRICAL
S
CHEMATICS
& W
IRING
H
ARNESSES
This owner's manual contains electrical
schematics and wiring harness illustrations for
your boat (See pages 6.17 thru 6.37). These
electrical schematics were generated by electrical
CAD designers at the engineering division for
technical reference and service technicians. Sea
Ray
® does not recommend that you attempt to
work on the boat’s electrical system yourself.
Instead we recommend that you take your boat
to your authorized Sea Ray
®
dealer for service.
Sea Ray
®
reserves the right to change or update
the electrical system on any model at any time
without notice to the consumer and is NOT
obligated to make any updates to units built prior
to changes.
Never disconnect the green wire (safety ground) from
the engine terminal.
! CAUTION
NOTICE
DO NOT PAINT BETWEEN THE ZINC AND THE
METAL IT CONTACTS, AND DO NOT PAINT OVER
THE ZINC.