TM 10-3930-669-20 CONTINUITY TEST (1)   Set multimeter select switch to OHMS. (2)   Check continuity between diode module DM2.    terminals  2  and  1  (forward)  or terminals 4 and 3 (reverse). (a)   If   there   is   no   continuity,   replace diode module DM2 (Para 7-33). (b)   If  there  is  continuity,  diode  module DM2 is OK. CONTINUITY TEST (1)   Ground diode module DM2, terminal 3. (2)   Remove relay R3 (Para 7-33). (3)   Set multimeter select switch to OHMS. (4)   Check    continuity    between    relay    R3, terminal  86  cavity  and  a  known  good ground. (a)   If    there    is    no    continuity,    repair replace    wire    41    (see    schematic Appendix F). (b)   If there is continuity, wire 41 is OK. Go to Step 6 of this Fault. (5)   Install diode module DM2 (Para 7-33). 2-279