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 416 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART — CONTINUED

ac. WINTERIZATION KIT CIRCUIT — CONTINUED

(1) COOLANT HEATER FAILS TO OPERATE –

CONTINUED

CONTINUED FROM STEP C

m

D

1. Reconnect bulkhead-to-coolant heater

control box wiring harness to heater control

box.

2. Disconnect battery ground leads.

3. Disconnect bulkhead-to-coolant heater

control box wiring harness from driver’s

bulkhead.

4.

Place red lead of muitimeter in socket C

(lead 403C) and black lead to ground.

5.

Reconnect battery ground leads.

6.

Turn MASTER switch ON, heater control

switch to start, and check for voltage.

7.

Turn MASTER and heater control switches

OFF.

Is voltage present?

I

I

Repair or replace lead 403C bulkhead-

to-coolant heater control box wiring

harness (para 14-8).

Repair or replace lead 403C of coolant

heater-to-bulkhead wiring harness

(para 14-8).

END OF TASK

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