TM 5-6115-593-12TO 35C2-3-463-1Table 4-3. Organizational Troubleshooting-ContinuedMALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTION10. ENGINE WILL NOT START IN COLD WEATHER-continuedIf S2 is not defective, the ether aid control relay K24 (part of AC-DC control relay assembly, 18,figure 4-19) or the ether solenoid (14, figure 4-39) may be defective. The ether solenoid can bereplaced as part of the ether kit (see paragraph 4-65). Relay K24 must be referred to next higherlevel of maintenance for testing or replacement.Step 3.Check WATER TEMP gauge. Coolant temperature should read between 60 and 110°F (16° and 43°C).If temperature is below range, proceed to next step.If temperature is within range, the preheat system is functioning normally and malfunction must bereferred to next higher level of maintenance.Step 4.Use a multimeter to check for 120V AC across the coil of preheat contactor relay K107 (54, figure 4-12).If 120V AC is present, proceed to next step.If 120V AC is absent, test PREHEAT SYSTEM switch S105 (27, figure 4-13) and replace ifdefective (see paragraph 4-22).If S105 is not defective, check run/stop relay K1 (7, figure 4-19) for 24V DC across contacts 3 and4.If 24V DC is present K1 may be defective and should be referred to next higher level ofmaintenance for testing.Step 5.Test preheat contactor relay K107 according to paragraph 4-23.Replace K107 if defective (see paragraph 4-23).If K107 is not defective, proceed to next step.Step 6.Test heater contactor K109 (54, figure 4-12) according to paragraph 4-23.Replace K109 if defective, (see paragraph 4-23).If K109 is not defective, proceed to next step.Step 7.Test thermo immersion switch, S30 (13, figure 4-30A) according to paragraph 4-51.4-29
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