TM-5-3805-254-14-P-2

TRUCK, DUMP, 20 TON, 6X4, ON-OFF HIGHWAY 71,000 GVW, IHC MODEL F-5070 (CCE)

TECHNICAL MANUAL; OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT, GENERAL SUPPORT AND DEPT MAINTENANCE MANUAL (INCLUDING REPAIR PARTS INFORMATION AND SUPPLEMENTAL MAINTENANCE INSTRUCTIONS)

JUNE 1980

TM-5-3805-254-14-P-2 - Page 286 of 894

TRUCK SERVICE MANUAL

ELECTRICAL

Regardless of the construction, never operate the

starting motor more than 30 seconds at a time without

pausing to allow it to cool for at least Z minutes.

Overheating caused by excessive cranking will seriously

damage the motor.

For the most part a volt-ampere tester (SE2283)

will be used in performing the starter tests and the

instruction manual supplied with the tester will provide

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

selector 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 voltage is

available to operate ignition system 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

12volt electrical system).

If a reading of less than 9.6 volts is found, proceed

to the next test.

Fig.

5

Cranking Voltage Test

Test No.

2 Battery Capacity Test

The battery capacity test is performed to determine

if the battery is in satisfactory condition.

See "Battery"

Section B. If the battery passes this test, continue the

next test.

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