TM 9-2320-387-24-218-10.4Change 1NOTE• Ensure a jumper cable is attached to both alternator ground pointswhen attaching cables from test stand G- terminals.• Ensure a jumper cable is attached to both alternator 28V B+terminals when attaching cables from test stand G+ terminals.15.Connect cables from both alternator ground terminals to test stand G- terminal.16.Connect cables from both alternator positive terminals to test stand G+ terminal.17.Connect cable from alternator regulator IGN to test stand F terminal.18.Connect 28 VDC output and 14 VDC output to test stand.NOTEAuxiliary voltage and current meters may be required to measure14 VDC output.19.Fabricate a jumper wire with a ring terminal at both ends. Connect test stand wire from IGNITIONSWITCH terminal to F-B terminal.CAUTIONEnsure auxiliary measuring equipment is properly grounded to teststand. Failure to do so may lead to erroneous readings or damage toequipment.NOTEPrior to operation of test stand, ensure all switches and controls are in“initial” positions as referenced in Operator and Maintenance Manual,TM 9-4910-663-12 (UMC Model GSAR-500), or Operator andMaintenance Manual, TM 9-4910-485-12 (Sun Model AGT-9/9A).20.Set test stand as follows:ModelGSAR-500ModelAGT-9/9A(a) DC ammeter load and starter selectorX10500 amp(b) DC ammeter field and battery charge selectorX15 amp(c) Field circuit switchRegulatorRegulator(d) DC voltmeter circuit selectorRECT/GENRECT/GEN(e) Connect DC voltmeter (0-50 VDC) from point between regulator 14 VDC output and load in14 volt circuit (or 14 volt battery).(f)Connect ammeter (0-75 ADC) in load line from 14 V regulator to 14 V load.21.Turn test stand master power switch and master load switch to ON, and turn battery switch to24 VDC. Green lamp on test stand must illuminate.22.Perform no-load test. Set test stand battery circuit selector to 24 VDC, IGN switch to ON, and startvaridrive. Observing the DC voltmeter output voltage and tachometer rpm, increase speed untiltachometer reads 5000 rpm. Record voltmeter reading and refer to table 18-5, No-Load Test, fordiagnosis.NOTE• When tachometer reaches 3000 rpm, green lamp should go offindicating proper charging from alternator.• Normal voltage range is 26-30 VDC. High amperage is +10percent over the rated alternator output of 364 amps at 5000 rpm.23.Perform no-load test. Increase alternator speed to 5000 rpm; record results. Refer to table 18-5,No-Load Test, for diagnosis.18-3.1. 400-AMPERE DUAL VOLTAGE ALTERNATOR TESTING AND REPAIR (Cont'd)
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