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 222 of 1275

TM 9-2350-311-20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

i.

GLOW PLUGS CIRCUIT (ENGINE MODEL 7083-

(1) GLOW PLUG WAIT LIGHT FAILS TO OPERATE;

7391) — CONTINUED

GLOW PLUG SYSTEM OPERATES USING MANUAL

OVERRIDE — CONTINUED

CONTINUED FROM STEP A

1. Install inoperative LED (para 8-17).

2. Disconnect lead 486 from GLOW PLUGS

.

indicator light.

3. Place red lead of multimeters on lead 486 and

black lead to ground.

4. Turn MASTER and GLOW PLUGS switches

ON and check for voltage.

5. Turn MASTER and GLOW PLUGS switches

OFF.

Is voltage present?

Replace GLOW PLUGS

indicator light (para 8-17).

3-12 2