TM 10-3930-669-20 26.  ELECTRICAL SYSTEM DOES NOT MAINTAIN A CHARGE (CONT). KNOWN INFO Engine operates. Batteries OK. Alternator OK. Alternator power wire OK. POSSIBLE PROBLEMS Wire 34 faulty. Relay R1 ground wire faulty. Relay R1 faulty. Regulator faulty. KNOWN INFO Engine operates. Batteries OK. Alternator OK. Alternator power wire OK. Wire 34 OK. POSSIBLE PROBLEMS Relay R1 ground wire faulty. Relay R1 faulty. Regulator faulty. TEST OPTIONS Voltage test. STE/ICE-R #89. REASON FOR QUESTION If 22 to 24 vdc are not present, wire 34 is faulty. TEST OPTIONS Continuity test. STEACE-R #91. REASON FOR QUESTION If continuity is not present, relay R1 ground wire is faulty. 2-286