TM-9-2920-257-30&P Maintenance and Parts Manual for 200 Amp M113 Generator Download
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TM 9-2920-257-30&P (4) Electrical Continuity Check - Set ohmmeter to X10 scale and make sure ohmmeter is zeroed. Check the generator connector pins to insure all internal wiring is intact. Check output plug continuity (refer to table 2-6). If any reading is out of limits, replace generator front housing, in accordance with paragraph 3-4b, steps 1 thru 17. Table 2-6. OUTPUT PLUG CONTINUITY Ohmmeter Generator Output Plug Expected Scale Readings X 10K PIN B GND * Very High X 1 PIN B PIN C ZERO X 1 PIN B PIN D Very High X 10K PIN E GND * Very High (5) Diode heat sink tests - Remove all phase leads (P1-P6) from front housing (fig 2-14). Check the diode heat sink assembly using a diode tester. If diode tester is used, refer to manufacturers' instructions for proper connections. If a diode tester is not available, use a multimeter and the following procedures. CAUTION To prevent damage to the diodes, do not use an AC device, such as a leakage tester to check the diode heat sink. NOTE Do not allow sleeves on leads to slide down leads. Phase terminals without sleeves can short to alternator body. NOTE Heat sink diodes are de-rated for heavy duty performance. If diode failure is detected, examine the entire charging system for loose connections. If a diode failure is indicated, suspect stator failure as well. Change 1 2-21