OIL-WATER INDICATOR AND BUZZER DO NOT WORK WHEN COOLANT TEMPERATURE RISES ABOVE 230_F (110

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9.

Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

20. OIL-WATER INDICATOR AND BUZZER DO NOT WORK WHEN COOLANT TEMPERATURE RISES

ABOVE 230_F (110_C) (CONT).

Step 2

Check electrical leads at high water temperature switch for looseness or damage.

Tighten loose connections or replace damaged connection.

Step 3.

Check for continuity throughout buzzer and light wiring.

Repair or replace defective wires or connectors.

NOTE

Disconnect wire No. 120 from terminal No. 5 on buzzer. This will remove low air pressure

circuit from buzzer.

Step 4.

Turn ENGINE switch ON. Remove wire No. 32 from high water temperature switch and

touch it to ground.

If light and/or buzzer work, replace high water temperature switch (para 7-78).

Step 5.

If buzzer does not work, check for 24 volts on terminal No. 7 of buzzer.

If 24 volts are not present, trace wiring and correct problem. Refer to FO-1, Electri-

cal Schematic.

If 24 volts are present, replace buzzer (para 7-28).

Change 6

2-134.3