Page G-3
Repair and Service Manual
B
B
ELECTRICAL
Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
STARTER/GENERATOR
Starter Mode
When starting the engine, the field coils are in series
with the armature and the starter/generator operates as
a motor (Ref Fig. 4 on page G-5). 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 Mode
When the engine is running, the starter/generator
functions as a generator. This is used for charging the
battery and for the ignition system. Generated output is
controlled 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.
DIGITAL VOLT OHM METER
Before performing any test of wiring compo-
nents, disconnect the battery cables from the
battery posts to prevent electrical shock or
explosion (see procedure in Section “B”).
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). The
actual model may vary depending on availability. The
DVOM (digital volt ohm meter) shown is representative
only (Ref Fig. 3 on page G-3). Any DVOM may be used,
however the controls, displays and features may vary
depending on the make and model. Always follow the
meter manufacturer's recommendations and
instructions for the use and care of meter. For the
purpose of this section, the red probe
(+)
and black
probe (-) are used. Set the meter selector to the ohms
scale and check continuity 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 (
∞
).
Fig. 3 DVOM
TESTING IGNITION CIRCUIT
To prevent the possibility of injury resulting
from vehicle inadvertently starting, disconnect
battery for steps 1 through 8 (see Section B).
Tool List
Qty.
DVOM ..........................................................................1
If the engine will
not
turn over, proceed as follows:
1.Check the battery for a voltage reading which
should be between 12.2 and 12.5 volts. Inspect for
loose or dirty battery post connections.
2.Check for a blown in line fuse and replace if neces-
sary with a 7.5 amp fuse (Ref Fig. 4 on page G-5).
Содержание 625619 2012
Страница 6: ...Page iv Repair and Service Manual NOTES TABLE OF CONTENTS ...
Страница 181: ......