TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 269 of 1275

TM 9-2350-311 -20-1

ALTERNATOR FAILS TO CHARGE BATTERIES; GAGE

INDICATION: NOT CHARGING, UNSTEADY OR

INACCURATE READING

Applicable Configurations

.

.

References

M109A4/M109A5

TM 9-2350-311-10

TM 9-6140-200-14

General mechanic’s tool kit (item 64, Appx H)

. .

Equipment Condltions

Multimeter (item 36, Appx H)

Engine compartment access cover removed (para 11 -5)

TA-1 probe kit (item 43, Appx H)

Engine access door open (TM 9-2350-311-10)

(Long test leads may be needed for some tests;

Transmission access doors open (TM 9-2350-311-10)

16 AWG wire maybe used as an extension.)

CAUTION

Extremely low battery electrolyte levels will cause a low

voltage indication on BATTERY indicator on portable

instrument panel. Regulators can be damaged by

attempts to adjust rheostat beyond its stops when the

only problem is dry batteries.

m

NOTE

Vehicle idle speed must be 750 rpm in order for

alternator to charge property. Check idle speed before

troubleshooting

(TM 9-2350-311-10).

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1. Run engine at 1000 rpm.

2. Place red lead of multimeter on battery

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positive terminal and black lead to ground.

3. Check for voltage.

4. Turn engine off.

Is voltage 27.5 Vdc or higher?

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Go to step H.

CONTINUED ON NEXT PAGE

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