Systems
4-1
ELECTRICAL
There are two types of electrical systems used on most vessels. One is
called alternating current (AC for short). AC current travels one way in
a circuit and then in a fraction of a second moves in the other direction.
Alternating current is normally measured at 120 and 240 volts. Your
house is a typical example of alternating current. Larger vessels such
as express cruisers and sport yachts normally feature both AC & DC
systems.The other electrical system on board is called direct current
(DC for short). It is referred to as DC because it flows one-way in a
circuit.This system is found on the 2700-2750 and most sportboats in
today’s boating market.
Storage batteries (sometimes called wet- lead cell
batteries) furnish 12 volt electricity to boat
components. Storage batteries use 2 dissimilar
metals immersed in an liquid to carry current
(acid). The engines require large reserve amounts
of battery power for starting purposes. Check
the maintenance chapter for battery information.
The automobile battery is charged up by the engine alternator. The
same holds true for the marine battery. The dash volt meter displays
the battery voltage. If the volt meter shows below 12 volts there could
be a charging system malfunction. This condition needs to be
investigated before the batteries become completely drained.
Direct Current (12 volt DC)
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