TM 9-2320-289-20Table 2-4. Electrical Troubleshooting (Con’t)MALFUNCTlONTEST OR INSPECTlONCORRECTIVE ACTlONCAUTIONDO NOT leave key in “RUN” position for more than 2 minutes. Failure tofollow this caution may result in damage to glow plugs.Step 2.Turn key to “RUN” position. Check for voltage between glow plug relay terminalwhere orange lead connects and ground.NOTEGlow plugs will cycle to 0 volts in approximately 20 seconds after firstoperation. Time will shorten as glow plugs become hotter.If there are 10.0-15.0 volts, ensure that engine is mechanically sound and fuelsystem is operating properly,If there are 22.0-28.0 volts, perform step 3.If there is no voltage, perform step 4.Step 3.Disconnect each glow plug lead and check for resistance between glow plug terminaland ground. Resistance should be 1-3 ohms. Check glow plugs for looseness ordamage.If any glow plug does not have correct resistance or is damaged, replace, (Seeparagraph 3-20) Tighten any loose glow plugs.Step 4.Tag and disconnect all glow plug leads from glow plugs. Check for voltage betweenglow plug relay terminal where red lead connects and ground.If voltage is 10.0-15.0 volts, connect glow plug leads and start engine.If voltage is 22,0-28.0 volts, perform step 5.If there is no voltage, trace circuit back to positive terminal board. (See wiringdiagram F-7 or F-8)Change 22-65
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