Section 4
4-14
350 Express Series
The DC system wires are identified by three colors. Red wires are +12
volts, yellow wires are DC common and gray wires are DC control
wires. Bonding wires are green. AC system wires use three colors.
White wires are AC neutral. Black wires are AC hot wires in 120V AC
systems. Black and red wires are the ungrounded wires in 240V AC
power systems.
Individual harness wires are identified with wire number and function
by lettering which is printed by an inkjet printer every 3 in. (0.076 m)
on the wires. This information aids in identifying wire functions for
troubleshooting. Battery cables are identified by labels on both ends
of each cable.
A bonding wire is extended through a #6 green wire from the bonding
strip to a terminal behind the instrument panel. This will facilitate
electronics installation. In addition, the handrails are attached to the
bonding system.
All batteries are isolated from each other by a battery isolator. When
the engines and ignition switches are off, the isolator prevents house
battery loads from discharging the cranking batteries. When the
batteries are being charged by the alternators, the isolator
automatically isolates the batteries and will distribute the charge
among the batteries according to individual need.
DC Master Panel
The DC master panel consists of a voltmeter, ammeter, a battery test
switch, a series of switch-type and resettable circuit breakers, a
generator start switch and the DC main circuit breaker.
The meter is a convenience feature which allows you to check on the
condition of the batteries. With master breaker switch in OFF position,
turn battery test switch to:
• STBD - to check the starboard engine cranking battery
• PORT - to check the port engine cranking battery
• GENERATOR - to check the generator cranking battery
• HOUSE - to check the house batteries and
• OFF - to disable meter and test circuit
The switch-type circuit breakers allow you to manually enable or
interrupt a circuit by moving the switch on or off, and they protect the
system receiving the DC power by automatically opening the circuit
should a short or overload condition occur.
The resettable circuit breakers protect the system receiving the DC
power by automatically opening the circuit should a short or overload
occur.
OPERATION OF DC SYSTEMS
Read through the table on the following pages to familiarize yourself
with the DC systems on your yacht.
CAUTION
DO NOT reset a breaker which has been automatically
tripped without first identifying and remedying the
cause of the problem.
DANGER
A glowing red polarity light indicates that a reversed
polarity electrical shock hazard exists and damage to
appliances will occur. DO NOT use shore power while
red light is ON. Disconnect the shore cord and have
the shore outlet serviced by a qualified electrician
before using.
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