CHAPTER 2. GENERATOR TROUBLESHOOTING

TM 9-2920-257-30&P

CHAPTER 2

GENERATOR TROUBLESHOOTING

Section I. General

2-1. GENERAL INSTRUCTIONS AND PROCEDURE

a. This chapter contains troubleshooting information and procedures for locating and correcting malfunctions in the

various component parts of the generators.

b. Perform inspection of the generator after removal from the vehicle or engine to verify any diagnosis made when

the unit was mounted on the vehicle or engine, to uncover further defects, or to determine malfunctions. This inspection is

important because it is often your only means of determining the malfunction without completely disassembling the

generator.

c. Troubleshoot a disabled generator, after removal from the engine, by subjecting it to tests described in this

manual.

d. A multimeter will be used for ampere, volt and ohm testing.

2-2. ON VEHICLE TEST

a. It is easier to examine the generator on the vehicle, by examining the charging and ignition systems of the vehicle

at the same time.

b. Refer to respective vehicle operator's and/or maintenance manuals to verify:

(1) Vehicle belt tension

(a) Use belt tension gauge for appropriate belting system.

(2)

Battery condition

(a) Battery must be in good condition and fully charged.

(3)

Electrical connection in the charging circuit

(a) Make sure all connections are clean, tight, and free of corrosion.

(4)

Ignition circuit

(a) Check for 24 volts nominal at regulator pin F.

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