TM 10-3930-675-20-10025 00-18ENGINE BATTERY VOLTAGE CIRCUITS TROUBLESHOOTING - CONTINUED0025 00Table 5. Error Code 1596 - Voltage Monitor, High Voltage Failure Troubleshooting Procedures.MALFUNCTIONTEST OR INSPECTIONCORRECTIVE ACTIONError Code 1596 - Voltage Monitor, High VoltageFailure - 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 insystem.If voltage is not as required,charge or replace battery (WP0107 00).4. Place ignition switch in OFFposition and install ammeterbetween alternator and battery.Perform the following to checkcharging rate of alternator.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.+12V = STATIC+6V = START
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