TM 9-2320-289-20Table 2-4. Electrical Troubleshooting (Con’t)MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONStep 3.Remove low coolant module (located near fuse box).If light goes out, replace low coolant module.If light does not go out, trace circuit. (See wiring diagram F-4 or F-6)27. FOUR-WHEEL DRIVE LIGHT INOPERATIVE (TRANSFER CASE IN FOUR-WHEEL DRIVE)Step 1.Check 20 amp ignition fuse.Replace fuse if burned out.Step 2.Turn key to “RUN” position. Disconnect lead from four-wheel drive switch ontransfer case and touch lead to any ground.If four-wheel drive light turns on, replace switch.If four-wheel drive light does not turn on, replace bulb. (See paragraph 4-7) Iflight still does not turn on, trace circuit. (See wiring diagram F-4 or F-6)28. FOUR-WHEEL DRIVE LIGHT TURNS ON (TRANSFER CASE NOT IN FOUR-WHEEL DRIVE)Step 1.Turn key to “RUN” position. Disconnect lead from four-wheel drive switch ontransfer case.If four-wheelIf four-wheelF-6)29. FUEL GAGE INACCURATEdrive light goes out,drive light stays on,Step 1.Check 20 amp ignition fuse.Replace if burned out.CAUTIONreplace switch.trace circuit. (See wiring diagram F-4 orDO NOT leave keyfollow this cautionin “RUN” position for more than 2 minutes. Failure tomay result in damage to glow plugs.Step 2.Disconnect fuel tank sending unit ground from frame. Turn key to “RUN” position. If fuel gage reads “F“ (Full), perform step 3.If fuel gage does not read “F” (Full), replace fuel gage. (See paragraph 4-7)2-70
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