TM-9-2350-311-20-1 Maintenance Manual for Volume 1 M109 Hull Download
Page 376 of 1275
TM 9-2350-311-20-1 3-3 TROUBLESHOOTING CHART — CONTINUED x. INSTRUMENT PANEL/PORTABLE INSTRUMENT (1) ONE OR MORE INSTRUMENT PANEL LIGHTS FAIL PANEL LIGHT CIRCUIT — CONTINUED TO OPERATE — CONTINUED CONTINUED FROM STEP A 1. 2. 3. 4. 5. Install inoperative panel light bulb (para 8-17). Disconnect accessory control box-to-heater/ blower wiring harness from accessory control panel. Place red lead of multimeters in socket D (lead 40) and black lead to ground. Turn MASTER and instrument panel light switches ON and check for voltage. Turn MASTER and instrument panel light switches OFF. Is voltage present? Repair or replace lead 40 of accessory control box wiring harness (para 8-53). 1. 2. 3. 4. 5. Reconnect accessory control box-to-heater blower wiring harness from accessory control panel. Disconnect lead 40 of accessory control box to heater/blower wiring harness from “Y” connector. Place red lead of multimeters on “Y” connector and black lead to ground. Turn MASTER switch ON, instrument panel light switch on, and check for voltage. Turn MASTER and instrument panel light switches OFF. Is voltage present? Repair or replace lead 40 of accessory control box-to-heater/blower wrong harness (para 8-2). 3-276