TM 9-2320-28Table 2-4. Electrical Troubleshooting (Con't)M A L F U N C T I ONTEST OR INSPECTIONCORRECTIVE ACTIONCAUTIONDo not leave key in "RUN” position for more than 2 minutes. Failure tofollow this caution may resuit in damage to glow plugs.Step 2.Remove glow plug modu!e. (See paragraph 4-8) Turn key to “RUN” position. Usingjumper wire, ground dark blue lead.If “WAIT” light turns on, turn key to “OFF” position, reinstall glow plug module,and perform step 3.If “WAll-” light does not turn on, replace bulb. If “WAIT” light still does not turncm, trace circuit. (See wiring diagram F-7 or F-8)Step 3.Turn key to “RUN” position. Disconnect connector from glow plug switch on upperleft rear of cylinder head.If “WAIT” light turns on, replace glow plug switch. (See paragraph 3-20)If “WAIT” light does not turn on, perform Electrical Troubleshooting malfunction#1517.“WAIT” LIGHT ON CONTINUOUSLY WITH KEY IN “RUN” POSITIONStep 1.Remove glow plug moduleIf “WAIT” light stays on, trace circuit through dark blue lead to “WAIT” light.(See wiring diagram F-7 or F-8)If “WAIT” light goes out, perform Electrical Troubleshooting malfunction #15.18."WAIT” LIGHT OPERATES UPON RESTARTING (ENGINE HOT)Step 1.Check connections at glow plug switch on upper left rear of cylinder head and glowplug module.If connections are not good, clean and secure all connectors.If connections are good, perform Electrical Troubleshooting malfunction #15.19. ENGINE CRANKS BUT WILL NOT START; ENGINE COLD; “WAIT” LIGHT OPERATESStep 1.Ensure that key is in “OFF” position. Check for voltage between glow plug relayterminal where orange lead connects and ground.If there IS voltage, replace glow plug relay (see paragraph 4-8) and performstep 3.If there is no voltage, perform step 3.2-64Change 2
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