17
Systems
Your Regal boat uses 12 volt DC electricity otherwise
known as direct current. It is called DC because it fl ows
only one way in a circuit. Specifi cally to name a few,
helm gauges, batteries, battery cables, engine electrical
components, engine wiring harnesses, dash switches,
selected lighting, shower sump, bilge pumps, and vacuum
toilets are all components using a 12 volt DC system.
In the DC system used in the United States the red wire
is designated as the “hot” or conductor wire and the
black wire is referred to as the ground wire. At times
other current carrying wires are color coded such as blue
to identify their use as a low voltage conductor. This is
especially helpful in troubleshooting and adding additional
equipment. Be sure to review the wiring schematics in the
drawing section of the technical chapter.
Direct current is stored in the ship’s batteries and produced
through the engine alternators while the engines are
running or by the battery charger at dockside.
The alternators charge the batteries by sending current
through the main distribution panel relays, battery switches
and harnesses to the appropriate battery. Normal DC
voltage is between 12 and 15 volts. Lower or higher
readings could indicate a charging malfunction or a weak
battery.
The engine alternators used on your boat are internally
self “excited” and produce DC current at idle. Normal
altenator output would be around 65 amps.
Typical battery circuitry includes:
The port cranking battery controls the port engine and
windlass.
The starboard battery controls the starboard engine and
generator.
The house battery controls a variety of onboard
equipment.
DIRECT CURRENT (12 VOLTS)
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