DIMMER SWITCH FAILS TO OPERATE.

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9.

Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

ELECTRICAL SYSTEM (CONT)

5. ONE OR MORE LIGHTS NOT WORKING (WARNING, SERVICE, OR BLACKOUT DRIVE LIGHT)

(CONT).

Step 5.

Check wiring harness for loose connections or broken parts.

Repair wiring harness and/or replace broken pins.

Step 6.

Check for defective main light switch.

Operate light switch (TM 9-2320-279-10).

Step 7.

Disconnect connector from back of main light switch (para 7-41). Set multimeter to

test for 24 vdc. Place negative (--) probe to a ground and touch positive (+) probe to

socket F (wire 674) on connector. Meter should show 24 vdc.

If meter does not show 24 vdc, trace wiring and find problem. Refer to FO-1,

Electric Diagram.

If meter shows 24 vdc, replace defective main light switch (para 7-41).

6. DIMMER SWITCH FAILS TO OPERATE.

Step 1.

Check dimmer switch for continuity.

Replace defective dimmer switch (para 7-102).

Step 2.

Check dimmer switch wiring circuit for continuity. Refer to FO-1, Electric Diagram.

Repair or replace defective wires or connectors.

Change 6

2-121