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 263 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP I

2.

3.

4.

5.

6.

7.

1.

Reconnect

powerplant wiring harness to

rectifier.

Disconnect rectifier-to-voltage regulator

wiring harness from rectifier.

Place jumper wires from pin E (lead 3) to a

battery negative terminal and pin B (lead 1 ) to

positive terminal of same battery.

Turn MASTER switch ON and run vehicle

engine at idle speed (750 rpm).

Set multimeter on dc scale and place red lead

of multimeter on pin C (lead 2) and black lead

to ground.

Check for voltage.

Turn MASTER switch and enqine OFF.

Is voltage above 27.5 Vdc?

1.

I

Replace rectifier (para 8-4).

2.

3.

4.

5.

6.

7.

Reconnect rectifier-to-voltage regulator

wiring harness to the rectifier.

Disconnect rectifier to voltage regulator

wiring harness from voltage regulator.

Place jumper wires from pin E (lead 3) to a

battery negative terminal and pin B (lead 1 ) to

positive terminal of same battery.

Turn MASTER switch ON and run vehicle

engine at idle speed (750 rpm).

Set

multimeter on dc scale and place red lead

of multimeter on pin C (lead 2) and black lead

to ground.

Check for voltage.

Turn MASTER switch and engine OFF.

Is voltage above 27.5 Vdc?

I

Repair or replace rectifier-to-voltage

regulator wrong harness (para 8-59).

I

CONTINUED ON NEXT PAGE

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