TM-9-2350-274-BD
M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED
TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
JANUARY 1984
TM-9-2350-274-BD - Page 91 of 219
TM 9-2350-274-BD
CHAPTER 6
ELECTRICAL SYSTEM
BDAR FIXES SHALL BE USED ONLY IN COMBAT
AT THE DISCRETION OF THE COMMANDER
AND SHALL BE REPAIRED BY STANDARD MAINTENANCE PROCEDURES
AS SOON AS PRACTICABLE AFTER THE MISSION IS COMPLETED.
SECTION I. General
6-1. General.
The M 109 electrical system is 24VDC using four storage batteries to provide power without the engine
operating. The engine mounts a 28 volt alternator used to recharge the batteries through a rectifier which
changes the AC current to DC and a voltage regulator which controls the amount of current flow. The
M110/M578 electrical system is provided power by a 24 volt 300 amp generator and four series -
parallel - connected 12 volt storage batteries. Output of the generator is controlled by a solid state voltage
regulator. A slave receptacle is located in the battery compartment to allow an outside source to provide
electrical current if the batteries fail. The electrical circuit protection is provided by circuit breakers
located in back of the driver’s instrument panel. This chapter provides methods which can correct some
faults, see also TM 9-2350-276-BD for other electrical repairs.
6-2. Assessment Procedure.
-batteries . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD
-cables . . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD
-wiring . . . . . . . . . . . . . . . . . . . . go to TM 9-2350-276-BD
-circuit breakers . . . . . . . . . . . . . go to para 6-5
-voltage regulator . . . . . . . . . .
. . go to Standard Maintenance TM
-alternator . . . . . . . . . . . . . . . .
. go to Standard Maintenance TM
-alternator drive . . . . . . . . . . . .
. go to Standard Maintenance TM
-alternator output function. . . .
. . go to Standard Maintenance TM
-voltage regulator function . . . .
. . go to Standard Maintenance TM
-circuit breakers. . . . . . . . . . . . . go to para 6-5
Change 1
6-1
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