ELECTRIC SYSTEM

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FIRE EXTINGUISHING SYSTEM

TM-5-1940-277-20 Boat Bridge Erection Twin Jet Aluminum Hull MODEL USCSBMK1 (1940-01-105-5728) MODEL USCSBMK2 (1940-01-218-9165) Manual

ELECTRIC SYSTEM-cont.

TM 5-1940-277-20

TM 1940-20/2

1-17. ELECTRIC SYSTEM. The boat electrical system is 24 vdc. 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.

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.

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.

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.

Engine Alarm Mute Switch - allows operator to turn off engine audible alarm that indicates low engine oil pressure

or high water temperature.

Masthead Light - is located on top of the mast and is to be lit when boat is anchored. The light is white.

Towing Lights - are located at the middle of the mast and are to be lit when the boat is towing. The forward light

is white and the stern light is yellow.

Mast Lights - are located at the middle of the mast and are to be lit when the boat is underway. Both lights are

white.

Side 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 com-

bat conditions. They are intended for use in waters subject to boat traffic.

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.

Inspection Light - is an extension light located in the engine compartment.

Batteries - are located in the battery compartment and supply the electrical power.

Hour Meters - are located in the battery compartment and record the number of hours the engines are operated.

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.

Slave Receptacle - is located outside the battery compartment on the starboard side (MK1), or inside the battery

compartment (MK2). It is used to slave start the boat when necessary.

Master Battery Switch - is located next to the slave receptacle and turns ON and OFF all electrical power on the

boat.

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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