mjm yachts 50z Downeast, Owner'S Manual

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6.5
6.6
6.7
6.8
6.9
ELECTRICAL SYSTEM
REVERSE POLARITY
As a safety precaution, your AC panel is fitted with reverse polarity indicators. If
an AC supply were wired incorrectly, either aboard your boat or shoreside, a dangerous shock
situation could exist. Normally, the reverse polarity lights should not be illuminated. If they are,
disconnect that source of power and alert the appropriate person.
ELECTROLYSIS & GALVANIC CORROSION
Metallic fittings that are exposed to saltwater are subject to electrolysis and galvanic corrosion. To
minimize potential damage, your boat is fitted with a sacrificial zinc at the transom. This zinc is
connected to the bonding system of your boat. It should be visually inspected whenever possible
and replaced when 1/2 of the zinc has been eroded. Pay special attention to its condition when in
new waters and marinas, as environmental conditions affect the rate of deterioration. If the zinc
erodes rapidly, current meters can be used to assess possible causes and remedies. See the
Volvo Penta Operator’s Manual for sacrificial anode location and inspection on the engine as well
as the drives.
BONDING
The bonding system of your boat connects all underwater metallic fittings to the sacrificial zinc
and the boat’s negative bus bar. In order for the zinc to protect an underwater part, the
connection must be clean and secure. The green wires that make up this system are not normally
current carrying.
ELECTRICAL SAFETY
Please read and understand the important safety precautions included in the included NMMA
publication “Sportfish, Cruisers, Yachts – Owner’s Manual” concerning electrical safety.
FUSE LOCATIONS & SPECIFICATIONS
See the attached Chart of Fuse Descriptions Type and Locations
CHAPTER 6