Systems
4-1
ELECTRICAL
The electrical system on board your vessel is known as direct current
(DC for short). It is referred to as DC because electricity
fl
ows one-
way in the circuit. Most DC circuits identify positive (+) wires as red
and negative (-) wires as black.
Storage batteries (often known as a lead-acid cell
battery) furnish 12 volts of 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. The
automobile battery is charged up by the engine
alternator as is the marine battery. The dash volt
meter displays the battery voltage. If the volt
meter shows less than 12 volts there could be a
charging system malfunction. This condition needs to be investigated
before the battery(ies) become completely drained. The typical battery is
maintenance free and features 650 to 1000 cold cranking amps (CCA).
Check chapter 7 for battery maintenance information.
Note: Never disconnect a batery terminal with the engine running as
engine/charging system damage may result.
Direct Current (12 volts)
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