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 387 of 1275

TM 9-2350-311-20-1

CONTINUED FROM STEP A

1.

-

2.

3.

4.

5.

6.

7.

8.

Reconnect accessory control box-to-heater/

blower wiring harness to personnel heater.

Disconnect battery ground leads.

Disconnect accessory control box-to-heater/

blower wiring harness from accessory control

box.

Place a jumper wire from pin A to socket A

(lead 400).

Place red lead of multimeters in socket E (lead

405) and black lead to ground.

Reconnect battery ground leads.

Turn MASTER switch ON, HEAT

SELECTOR switch to LOW and check for

voltage.

Turn MASTER and HEAT SELECTOR

switches OFF.

is voltage present?

I

Go to step D.

I

1. Disconnect battery ground leads.

2. Place red lead of multimeters on pin A (lead

400) and black lead to ground.

3. Reconnect battery ground leads.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Troubleshoot master relay circuit

I

Repair or replace lead 400 of accessory

control box wiring harness (para 8-53).

3-287

(para 3-3b).