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

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