ENGINE DIVISION SERVICE MANUAL
ELECTRICAL
Fig. 4. Sectional View of Starting Motor with DR-250 Heavy Duty Drive
Regardless of the construction, never operate the
starting motor more than 3( seconds at a time without
pausing to allow it to cool for at least 2 minutes
Overheating caused by excessive cranking will seriously
damage the motor.
For the most part a volt-ampere test (SE-2283) will
be used in performing the starter tests and the instruction
manual supplied with the tester will pro-vide the detailed
instructions using the volt-ampere tester.
NOTE: All illustrations of starting motor and circuit
tests show leads connected for NEGATIVE grounded
system. Reverse the positions of the leads when
testing a POSITIVE grounded system. Make sure the
volt
se-
lector switch on the volt-ampere tester is positioned
properly for the voltage system being inspected.
Test No 1 - Cranking Voltage Test
This test tells us the overall condition of battery, starter,
cables or switches to determine if sufficient volt-age is
available to operate ignition sys-tem when starter is in
operation.
Connect voltmeter leads at the starter observing the
polarity, Fig. 5. Disconnect secondary coil lead to
prevent engine from starting. Crank engine noting
voltmeter reading (should be 9.6 volts or better with 12-
volt electrical system).
If a reading of less than 9.6 volts is found, proceed to
the next test.
.
CGES-230 - Page 5
PRINTED IN UNITED STATES OF AMERICA
