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 122 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

b. MASTER RELAY CIRCUIT — CONTINUED

(1) MASTER SWITCH INDICATOR LIGHT IS LIT –

CONTINUED

CONTINUED FROM STEP B

I

1. Reconnect lead 81 to master relay.

2. Place red lead of multimeter on positive

battery post and black lead to ground.

3. Check for voltage.

4. If voltage is below 18 Vdc, clean, tighten,

repair, or replace necessary cables.

5. Check for voltage.

I

I

Is voltage above 18 Vdc?

Check each battery and replace as

required (para 8-28).

Repair or replace lead 81 of engine

disconnect bracket-to-bulkhead wiring

harness (para 8-45, M109A2/M109A3; para

8-46, M109A4/M109A5).

END OF TASK

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