It is the boat owner’s responsibility to check for and replace dam-
aged parts due to galvanic deterioration. Refer to your Chaparral
dealer to investigate the source of stray corrosive currents.
Zinc plates are installed on the transom and trim tabs to protect
underwater hardware on your boat. Zinc is less noble than copper
based alloys and aluminum used in underwater fittings; therefore, it
will deteriorate first and protect the more noble parts.
Zinc anodes generally require replacement about once a year. (In
salt water areas, replace every six 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 are not replaced
annually, they may not be providing the necessary protection.
Note: Do not paint between the zinc and any metal it touches.
Do not paint over the zinc.
When an AC shore power system is connected to the boat, the
underwater metal fittings will be connected through the water to
grounded metals ashore. The zincs will be consumed as a faster
rate unless the marina maintains a protective system to prevent this.
Placing 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.
Important: All electrically operated DC equipment and acces-
sories must be wired so that the ground polarity of each device
is the same as that of the battery. Chaparral boats have a nega-
tive ground system, which is recommended practice
throughout the marine industry. All metal items (fuel tanks,
underwater hardware) in the boat are connected to the zinc
anode by the green bonding wire.
Once a year
(Performed by a qualified marine technician)
Verify the integrity of the boat’s entire AC shore power grounding
system, including the connection to the DC system negative.
Verify that any galvanic isolators (if installed on your boat) meet
current American Boat & Yacht Council (ABYC) standards and are
fully functional.
Inspect shore power cords, adapters and boat receptacles for any
signs of deterioration, including cord wear, loose connections, signs
of sparking or overheating and bent or pitted blades. If there are any
such signs, examine, correct, and test the equipment or replace it.
Operate the boat’s electrical system at full load (everything on) and
check for AC system leakage or voltage between the boat’s under-
water fittings (bonded system, if equipped) and the shore side AC
system ground.
General Electrical System Information
Electrical panel and shore power inlet wire connections may possi-
bly loosen over time. Chaparral recommends having your dealer
check these connections at least annually, or if you are having any
electrical system problem.
Due to potential electrical shock hazard,
do not attempt this service procedure yourself.
Your dealer is
trained to properly diagnose and correct electrical problems safely.
Galvanic Isolator
A galvanic isolator is installed in your boat and electrically con-
nected between the boat’s AC panel ground and the dockside AC
ground wire. The galvanic isolator is designed to permit AC ground
currents to pass safely between the boat and the dockside, but to
CAUTION: Replace zinc sacrificial anodes if they are corroded
50% or more.
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