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Crusader
MC-8
MAINTENANCE
DArE_J_ul-+--'-y,_19_73 _ _ ]
·MANUAL
ELECTRICAL SYSTEM
ELECTRICAL SYSTEM
DESCRIPTION
The coach uses a 24-volt electrical system. A 24-
volt self-rectified alternator is belt-driven from the
engine and can be reached through the left rear
engine compartment door.
BATTERY DISCONNECT
A main battery disconnect switch is provided to
shut off all electrical supply from the batteries. The
switch is mounted on a vertical panel above the bat-
teries and can be reached by opening the battery com-
partment door. To disconnect batteries, pull knob
down to "off' position.
Battery Disconnect Switch
Installed
WIRING DIAGRAMS
At the end of this section are included wmng
diagrams for various circuits of electrical system.
Diagrams provided and components in each are as
follows:
CHARGING SYSTEM: Includes charging circuit,
showing generator, regulator, batteries, discharge
relays and tell-tales, field relays, and starter con-
nection.
LIGHTING SYSTEM: Shows interior and exterior
lights, relays and switches and turn signal light and
switches.
MOTOR CONTROL SYSTEM: Shows wiring for
engine starting circuit, engine shut-off system, reverse
shift circuit, etc.
ALARM & TELL-TALE SYSTEM: Shows wiring
for overheating, low oil, low air, and fire alarm war-
ning systems, passenger chime, lavatory alarm, etc.
HEATING &
AIR-CONDITIONING: Includes
wiring for heating and
air-conditioning motors,
valves and controls, etc.
P.A. SYSTEM: Shows wiring for Public Address
System. (If used).
INSTRUMENT WIRING SYSTEM: Shows wiring
of oil, temperature and fuel gauges, also shows water,
oil pressure and fuel sending units.
TEMP-N-LEVEL CONTROLS SYSTEM: Shows
wiring on oil level, Hot Engine and surge tank relays,
also shows Surge tank, Hot Engine oil level and low
fuel level sensors. Also shows water level, low oil,
Hot Water telltales, engine stop relay and 3 lb. oil
switch.
BAGGAGE
COMPARTMENT
IN-STATION
LIGHTENING:
Shows
baggage
compartment
lightening connections, circuit breakers and fuses.
IN-ST A TION
HEATERS:
Shows
wmng
of
lavatory tank, engine block, oil pan immersion
heaters connections, control thermostat and ambient
control switch.
TESTING CIRCUITS
A careful study of the wiring diagrams should be
made to determine the source and flow of current
through each electrical circuit. When a circuit is
thoroughly understood, a point to point check can be
made with the aid of the applicable wiring diagram,
to determine location of trouble. Any circuit can be
tested for continuity or short circuits with a 2-
candlepower test light or voltmeter.
All electrical connections must be kept clean and
tight. Loose or corroded connections will cause
discharged battery, difficult starting, dim lights, and
improper functioning of other electrical circuits. In-
spect all wiring connections at regular intervals.
Make sure knurled nuts on all amphenol plugs are
securely tightened.
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