rectifier diode for continuity which must be indicated in
one direction only.
Using leads disconnected from the
rotating rectifier, test continuity of the rotor windings. Use
a test lamp or multimeter and test through windings. If
continuity is not indicated, an open or short is present
and must be isolated.
Use a megohmmeter to test coil
insulation. Test between the shaft and each lead on both
rotors. A reading of less than 1.0 megohm indicates
Test the exciter stator (field winding)
for continuity through the windings. Use pins 1U and 13
on the generator receptacle. If continuity , not indicated,
each coil must be tested individually to locate the open.
Test alternator stator windings for
continuity at the receptacle (see figure 8-7). Test across
pins 5 and 8, 2 and 12, 6 and 9, 3 and 14, 7 and 10, and
1 and 4. Failure to obtain continuity indicates an open
coil which must be repaired or replaced.
Figure 8-7 Lead connections (Model MEP-018A).