(a) See detail A, Figure 5-1. Check the polarity of the rectifiers on the rotating rectifier assembly. There
are three standard polarity rectifiers (36) on one rectifier angle and three reverse polarity rectifiers (35) on
the other rectifier angle.
(b) Test each rectifier for proper operation using a multimeter set for resistive reading. Remove the bolted
leadwires from all rectifiers at the terminal studs. Test the resistance between the disconnected leadwire
and base of each rectifier. Ensure that all rectifier lead wires are disconnected and separated. Note the
reading and reverse the multimeter probes. One reading should be high and the other low if the rectifier is
good. If this is the case, proceed to the next rectifier, repeating the procedure until all six rectifiers have
been checked. If the high and low reading is not achieved, the rectifier tested is defective and should be
replaced. Torque the new rectifier to 20 to 30 pound-inches (2.3 to 3.4 newton-meters).
(c) Locate the surge protector (37) and disconnect one of the two bolted surge protector leads. With
multimeter set for resistive reading, measure the resistance of the surge protector. Reverse the multimeter
probes and repeat the test. I resistance is low in one or both directions, replace the surge protector.
(d) If all readings are satisfactory, reinstall the rotating rectifier assembly in accordance with paragraph 5-9,
Repair. Repair the rotating rectifier assembly by replacement of damaged or defective components.
(a) Disassembly. See Figure 5-1, Detail A.
1 Tag and disconnect rectifier leads (41 and 42) with terminal lugs (43 and 44) by removing
hexagon head screws (45), nuts (40), and lockwashers (46).
2 Remove rectifiers (35 and 36) from angles (48) by removing attaching nuts, washers, and
3 Tag and disconnect surge protector (37) wiring by removing nuts (40). Remove surge protector
(37) by removing screws (47), lockwashers (46), and nuts (40) at both ends.
4 Remove rectifier angles (48) by removing nuts (40) and screws (45) at both ends of each angle.
(b) Assemble. See Figure 5-1, Detail A.
1 Install three standard polarity rectifiers (36) on one rectifier angle (48), if removed, and secure with
rectifier mounting hardware (36). Install three reverse polarity rectifiers (35) on the other rectifier
angle (48) and secure with rectifier mounting hardware (35). Torque to 20 to 30 pound-inches (2.2 to
2 Install rectifier angles (48) with mounted rectifiers on the insulator plate (49) using one hexagon
head screw (45) and nut (40) at the end of each angle (48).
3 Install surge protector (37) on insulation plate (49) and secure at both ends with screws (47),
lockwashers (46), and nuts (40). Connect surge protector wiring to the lower screw on each adjacent
angle (48) with a nut (40).
4 Connect rectifier leads as previously tagged to the wire hexagon head capscrews (45) at the top
end of the insulator plate and secure with lockwashers (46) and nuts (40). Remove and discard tags.