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).
I
1. Run engine at 1000 rpm.
2. Place red lead of multimeter on battery
I
positive terminal and black lead to ground.
3. Check for voltage.
4. Turn engine off.
Is voltage 27.5 Vdc or higher?
I
Go to step H.
CONTINUED ON NEXT PAGE
3-169


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