2-306.12 Change 4CREW AUTOMATIC FIRE EXTINGUISHING SYSTEMFIRE DETECTION TEST AND ALARMPANEL INDICATORS(EFFECTIVE FOR VEHICLES 345 AND ABOVE)TM 9-2350-267-20POWER ON LAMP DOES NOT LIGHT WHEN MASTER SWITCH ISTURNED ON. All other electrical systems operate.Before troubleshooting AFES, check the following1 Make sure MASTER switch is set to OFF (TM 9-2350-267-10).2 Make sure crew AFES T/A panel Maintenance switch is turned to mainte-nance position (p 14-14.5).NOTEl Instead of using multimeter for voltage check, STE/ICE troubleshooting,INDIVIDUAL BATTERY VOLTAGE TEST-TEST 89 maybe performed.l Instead of using multimeter for continuity check, STE/ICE troubleshooting,TEST 91 maybe performed.A.WARNINGTurn crew AFES T/A panel Maintenance switch tovertical position before disconnecting any electricalwiring harnesses. Failure to comply may result indischarge of extinguisher cylinders and injury topersonnel.Disconnect wiring harness 12352316 from crew AFES T/A panel. Place redlead of multimeter in socket B of harness 12352316 and ground black lead ofmultimeter. Check for 24 ± 3 vdc. Repeat procedure for socket A. If voltageis indicated in both sockets, connect wiring harness 12352316 to crew AFEST/A panel and go to step C. If voltage is not indicated in both sockets, go tostep B.
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