Figure 4-21. Motor (B3) Test Point

TM 5-4120-359-14

a. Test

(1) Remove connector plug P6 from connector J6.

Figure 4-21. Motor (B3) Test Point

(2) Using multimeter, check all P6 pins for shorts. Pin D is ground. Check pins A, B, C, E, and F to pin D. There

should be no reading. Check pin D to motor frame, multimeter should read 0.

(3) Using multimeter, check resistance of 3 phase motor windings at P6:

A to B

B to C

A to C

Resistances should all be above zero, but below 12 ohms.

(4) Using multimeter, check resistance between pins E and F. Resistance should be zero meaning thermostatic

switch is closed.

(5) If motor fails any of the above tests, repair it.

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