TM 9-2350-261-20-1S T E / I C E B A T T E R Y S E R I E S P A I R T E S T C A R DTHE BATTERY INTERNAL RESISTANCE TEST (73 or 77) evaluates the state of charge of the battery series pair. The BATTERY RESISTANCECHANGE TEST (75 of 79) evaluates whether the battery is good or bad, even if it is discharged A good battery that is discharged may be recharged. Abad battery may hold a charge for a short time.STE/ICE HOOKUP1. The power to operate the STE/ICE VTM may be taken from the batteries being tested as shown in the appropriate figure below or from aalternate power source (such as another vehicle’s batteries).2. Perform VTM general setup, run confidence test, and enter vehicle ID.3. Find a series pair of batteries. A battery series pair has the negative terminal of one battery connected to the positive terminal of anotherbattery by a cable. For example. in figures 1 and 2 below. batteries A and B are l series pair; and in figure 1 below batteries C and D are aseries pair.4. aIf power to the VTM comes from a different set of batteries than the batteries under test, use tests77 and 79 instead of tests 73 and 75 Connecttest probe cable W2 to the batteries under test. Connect the red clip to the positive terminal closest to the starter and the black clip lead to thenegative terminal closest lo the groundb.II power to the VTM comes from the same set of batteries as the batteries under test. use tests 73 and 75. The test probe cable W2 is not used5. Clamp the current probe around the cable connecting the two batteries. Point the arrow of the current probe along the cable leading towards thenegative battery terminal as shown below in figures 1 and 2 for batteries A and B.TEST PROCEDURE1.Condition the current probe before running these tests.2. Measure the battery resistance change by entering test number 75 or 79 (as described in the hookup procedure). Thenengage the starter for about5 seconds.3 Measure battery internal resistance by entering test number 73 or 77 (as described in the hookup procedure) Then engage the starter for about4. Compare the results of both measurements to limits in the vehicle/equipment TM or to limits on the reverse side of this card.5 If either measurement is outside of normal limits, check battery terminals and connections. and check. battery electrolyte level. Then perform bothmeasurements a second time.6. If the battery resistance change test (75 or 79) fails after the second measurement, then the battery series pair is in bad condition. Test each batteryindividually to determine which is good and which is bad or replace the battery series pair.7. II the battery internal resistance test (73 or 77) fails alter the second measurement, then the batteries should be recharged.Change 13-251
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