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 TM 5-1940-277-10
TM 1940-10/1
1-18. ELECTRICAL SYSTEM. The boat electrical system is 24vdc. Two 12 volt batteries are connected in series.
There are two sets of batteries for power. An alternator is fitted to each engine for charging the batteries. The circuits
are arranged so that EITHER alternator can charge EITHER set of batteries automatically. Power is drawn from the
batteries by two separate circuits. The batteries on the port side power the starter motor of both engines and the port
engine instruments. The batteries on the starboard side power the starboard engine instruments and the auxiliary
circuits.
a. Searchlight can be located on either the top of the cab (as shown) or on the console when the cab is removed.
The searchlight can be used as both a floodlight and spotlight.
b. Horn is located under the console (MK1) or on the front of the forward cockpit (MK2). The horn may be
sounded by pressing a button switch on the console.
c. Wiper Motors are located on the inside of the cab above the windshield. The motor operates the windshield
wipers in a back-and-forth motion.
d. Engine Audible Alarms are located under the console. These alarms are activated by low engine oil pressure or
high water temperature. They may be turned off by the engine alarm mute switches located on the control
panel.
e. Anchor Light is located on top of the mast and is to be lit when boat is anchored. The light is white.
f. Towing Lights are to be lit when the boat has a load under tow. There are two towing lights. One towing light is
a white light located on the forward side of the mast below the steaming light. The other towing light is a yellow
light on the aft side of the mast just below the anchor light.
g. Steaming Lights are located on the lower part of the mast and are to be lit when the boat is underway. Both
lights are white.
h. Navigation Lights are located on both sides of the mast. The starboard light is green and the port light is red.
NOTE
The anchor, towing, steaming and navigation lights are not intended for use under combat
conditions. They are intended for use in waters subject to boat traffic.
i.
Electric Bilge Pumps are for pumping out water that has collected inside the hull. One pump is located in the
engine compartment and one pump is located in the hydrojet compartment.
j.
Inspection Light is an extension light located in the engine compartment.
k.
Batteries are located in the battery compartment and supply the electrical power.
I.
Hour Meters are located in the battery compartment and record the number of hours the engines are
operated.
m.
Emergency Link Solenoid is located in the battery compartment and is used to connect both pairs of batteries
in parallel when additional power is required to start the engines.
n.
Slave Receptacle is located on the starboard side on the outside of the battery compartment. It is used when
it is necessary to slave start the boat.
o.
Master Battery Switch is located next to the slave receptacle and turns ON and OFF all electrical power on
the boat.
p.
Mast Receptacle and Mast Plug are located on the starboard side of the boat and supply power to the mast
lights.
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