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 417 of 1275

TM 92350-311 -20-1

(2) COOLANT HEATER MOTOR OVERHEATS

I INITIAL SETUP I

Tools

Equipment

Condition

General mechanic’s tool kit (item 64, Appx H)

Engine access door open (TM 9-2350-311-10)

Multimeter (item 36, Appx H)

Transmission access doors open (TM 9-2350-311-1 0)

TA-1 probe kit (item 43, Appx H)

Battery access doors open (TM 9-2350-31 1-10)

A

1. Disconnect battery ground leads.

2. Disconnect lead 403C from coolant pump.

3. Place red lead of multimeter on lead 403C

and black lead to ground.

4. Reconnect battery ground leads.

5. Turn MASTER switch ON and check for

voltage.

6. Turn MASTER switch OFF.

Is voltage present?

Repair or replace lead 403C of

coolant heater-to-bulkhead wiring

harness (para 14-8).

Replace coolant pump (para 14-4).

END OF TASK

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