TEST - TM-5-4210-224-14-P0474

TM 5-4210-224-14&P

5-9. ALTERNATOR REPAIR (Continued).

TEST

NOTE

Before preforming these tests inspect all parts for wear, cracks, or other mechanical defects.

Replace all damaged parts.

a. Positive Heat Sink Test.

NOTE

The positive heat sink is the one to which positive output terminal is connected. The square

hole in the positive heat sink is larger than the negative heat sink hole.

(1) Connect the positive lead of the test lamp to the positive heat sink and touch the negative test lead to each

of the three diode terminals. The test lamp should not light. If the test lamp lights, the diode is shorted.

(2) Reverse the test leads so that the negative test lead is connected to the positive heat sink. The positive

test lead should now be touched to each diode terminal. If the test lamp fails to light, an open diode is

indicated.

(3) If a shorted or open diode isetected replace the entire heat sink assembly.

b. Negative Heat Sink Test.

(1) Connect the negative lead of the test lamp to the negative heat sink and touch the positive test lead to

each of the three diode terminals. The test lamp should not light. If the test lamp lights, the diode is

shorted.

5-17