ELECTRICAL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
83
ELECTRICAL
CIRCUITS AND CONTROLS
The electrical system is a 12 volt negative ground system
consists of:
• Battery
• Starter/generator
• Voltage regulator
• Solenoid
•Magneto
•Fuse
•Key switch
To decrease the risk of injury or death from
accidental movement of vehicle, all tests per-
formed requiring starter/generator or engine to
rotate must be performed with the vehicle lifted
(see SAFETY section) or the neutral lock
engaged (see GENERAL INFORMATION AND
ROUTINE MAINTENANCE section).
Follow the lifting procedure in SAFETY sec-
tion. Place wheel chocks in front and behind
the front wheels. Check the stability of the
vehicle on the jack stands before starting any
repair procedure. Never work on a vehicle that
is supported by a jack alone.
STARTER
When starting the engine, the field coils are in series with
the armature and the starter/generator operates as a
motor (Figure 2). This circuit is controlled by a key switch,
fuse, accelerator limit switch and a solenoid. With the key
in the ON position, battery current is available to the
accelerator limit switch which remains open until the
accelerator pedal is pressed. When the pedal is pressed,
the plunger on the switch is released, the contacts close
and the ignition circuit is energized. Battery current then
energizes the solenoid which closes the contacts and
energizes the starter circuit. The starter/generator now
functions as a starter to start the engine.
GENERATOR
When the engine is running, the starter/generator func-
tions as a generator. This is used for charging the battery
and for the ignition system. Generated output is con-
trolled by the voltage regulator at 14.25 - 14.75 V, without
regard to engine speed. However, the charging current
will vary depending on the condition of the battery. If it is
fully charged, current is controlled at 3 to 5 amps.
WIRING
Before performing any test of wiring compo-
nents, disconnect the battery cables from the
battery to decrease the risk of electrical shock
or explosion (see procedure in SAFETY sec-
tion).
Electrical tests of the wiring for continuity may be made
with a DVOM (Digital Volt Ohm Meter) available through
the Service Parts Department (P/N 27481G01). Any
DVOM may be used, however the controls, displays and
features may vary depending on the make and model.
Set the meter selector to the ohms scale and check conti-
nuity between each circuit component as indicated.
Example: If a switch is open or if there is a break in the
wiring, the meter will display a visual signal. If an analog
meter is used it will read infinity (
).
TESTING THE IGNITION CIRCUIT
This section assumes the fuel system is functioning and
the engine is receiving fuel.
Tool List Qty.
DVOM ..........................................................................1
Spark Plug (NGK BPR2ES).........................................1
Spark Plug Tester ........................................................1
To decrease the risk of personal injury, never
operate the starter unless both spark plugs are
installed or the ignition system is disabled.
Fuel drawn into the cylinders will be expelled
through the spark plug opening and could be
ignited by the ignition system or another
source, resulting in a fire.
The engine incorporates a magneto type ignition system.
There is no distributor.
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