TM 10-3930-675-20-10025 00-25ENGINE BATTERY VOLTAGE CIRCUITS TROUBLESHOOTING - CONTINUED0025 00Table 7. Error Code 1598 - Voltage Monitor, Very Low Voltage Failure Troubleshooting Procedures - Continued.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 1598 - Voltage Monitor, Very LowVoltage Failure - Continued3. Turn ignition switch to OFFposition and measure batteryvoltage from positive (+)terminal to negative (-)terminal. Voltage should be+12V. Check voltage whiletrying to start engine. Voltageshould be at least +6V duringcranking. Check each battery insame way.If voltage is not as specified,service or replace battery (WP0107 00).4. Place ignition switch in OFFposition. Install an ammeterbetween alternator and battery.Perform the following steps tocheck charging rate ofalternator:If alternator is not chargingproperly, replace alternator (WP0069 00).a. Check battery voltage atslave receptacle with engineoff.b. Start engine and recheckvoltage. Voltage should beslightly higher than voltagechecked with engine off.c. Turn on lights. Checkamperage reading onammeter with engine on.Ammeter should have apositive (more or less)reading depending on chargeof batteries.DC AMMETERLIGHTS ONSLAVE RECEPTACLEVOLTAGE ENGINE ON>VOLTAGE ENGINE OFF+AMPERAGECHARGEWITH ENGINEONB+
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