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 261 of 1275

TM 9-2350-311-20-1
CONTINUED FROM STEP A
NOTE
For steps H, 1, J, and K, use heavy jumper wires with
alligator clips.
1. Disconnect powerplant wiring harness from
alternator.
2. Place jumper wires from pin E (lead 3) of
alternator to battery negative terminal and
pin D (lead 1) of alternator to positive
terminal of same battery to apply 12 Vdc
to alternator field.
3. Turn MASTER switch ON and run vehicle
engine at idle speed (750 rpm).
4. Set multimeters on ac scale, and place red
lead of multimeters on pin A (lead 500) and
black lead on pin B (lead 501).
5. Check for voltage.
6. Place red lead of multimeters on pin C (lead
502) and black lead on pin A (lead 500).
7. Check for voltage.
8. Turn MASTER switch and engine OFF.
Is voltage above 27.5 Vdc?
I
Replace alternator (para 8-2).
CONTINUED ON NEXT PAGE
3-161


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