TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).h. LIGHTS (continued).(3) MASTER WARNING LIGHT FAILS TO OPERATEWHEN ENGINE OVERHEATS. All other lightsoperate (continued).Repair wire 509 or replace wire harness12268418-1 (para 7-44). verifyproblem is solved.D. 1. Reconnect wire harness 12260287 atdriver’s bulkhead.2. Disconnect wire 509A from engine cool-ant temperature switch.3. Place one lead of multimeter on pin H ofwire harness 12268308 and other lead inwire 509A.4. Check for continuity.Is continuity indicated?Replace engine coolant hightemperature switch (para 7-37).Verify problem is solved.END OF TASK2-146Repair wire 509 or replace wireharness 12268308 (para 7-50)Verify problem is solved.
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