Table 2-6. OUTPUT PLUG CONTINUITY

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

Generator Output Plug

Expected

Scale

Readings

X 10K

GND *

Very High

PIN C

ZERO

PIN D

Very High

X 10K

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