TM 10-3930-669-20 25.  ENGINE STARTS WITH TRANSMISSION ENGAGED (CONT). KNOWN INFO 24 vdc circuits operate. Wire 39 or wire 40 OK. Diode module DM2 OK Wire 41 OK. Relay R3 ground wire OK. Relay R3 OK. POSSIBLE PROBLEMS Wire 33 faulty. Diode module DM 1 faulty. KNOWN INFO 24 vdc circuits operate. Wire 33 OK. Diode module DM1 OK. POSSIBLE PROBLEMS Wire 39 or wire 40 faulty. Diode module DM2 faulty. Wire 41 faulty. Relay R3 ground wire faulty. Relay R3 faulty. TEST OPTIONS Voltage test. STE/ICE-R #89. REASON FOR QUESTION If 22 to 24 vdc are not present, wire 33 is faulty.  If wire 33 is OK,    diode    module    DM1    is faulty. TEST OPTIONS Voltage test. STEFICE-R #89. REASON FOR QUESTION If 22 to 24 vdc are not present, wire 39 (forward) or wire 40 (reverse) is faulty. ¬ ¬ 2-276