TM  55-1520-240-T 4-6.7   ENGINE   NO.   2   TRIM   CIRCUIT   BREAKER   WILL   NOT   STAY   CLOSED   (Continued) 4-6.7 , DID CIRCUIT BREAKER OPEN BEFORE ENGINE TRIM SWITCH No DID CIRCUIT BREAKER OPEN WAS   SET   TO   RPM   INCREASE WHEN ENGINE TRIM SWITCH IS OR  RPM  DECREASE? SET   TO   RPM   INCREASE? CHECK FOR GROUND ON RE- MAINING WIRES ON TB18 TERM 6 IS GROUND PRESENT? DISCONNECT  COPILOT  THRUST GRIP  PLUG.  CHECK  FOR GROUND ON TB18 TERM 6. IS GROUND  PRESENT? LOCATE GROUND FAULT WIRE W639-316-22    OR    W552-163- 22  BETWEEN  CB  103CB5  AND TB18. REPAIR OR REPLACE WIRE AS REQUIRED. REPLACE  ENGINE  NO.  2 TRIM CIRCUIT BREAKER 103CB5. REPLACE COPILOT THRUST GRIP. REMOVE PILOT FLOOR PANEL. DISCONNECT PILOT THRUST GRIP PLUG 300P25. CHECK FOR GROUND ON TB18 TERM 6. IS REPLACE PILOT THRUST GRIP. GROUND  PRESENT? YES LOCATE  GROUND  FAULT  ON WIRE   W696-52-22   OR   W696- 47-22 BETWEEN RECEPTACLES 300J25   AND   300J26   AND TB18. REPAIR OR REPLACE WIRE AS REQUIRED. OPEN RIGHT ELECTRICAL COM- PARTMENT.  DISCONNECT  WIRE DISCONNECT PLUG 103P2 W592-41-22   FROM   RELAY FROM NO. 2 ENGINE CONTROL 103K2 TERM B2, CHECK FOR BOX 103A2. CHECK FOR GROUND ON WIRE. IS GROUND GROUND ON PLUG 103P2 PIN B PRESENT? IS GROUND PRESENT? RECONNECT  WIRE  W592-41-22 TO  RELAY  103K2.  REMOVE  CO- PILOT FLOOR PANEL. DISCON- NECT COPILOT THRUST GRIP PLUG 300P25, SET PILOT NO. 1 & NO. 2 ENGINE SWITCH TO RPM DECREASE. CHECK FOR GROUND ON TB18 TERM 13. IS GROUND  PRESENT? CONNECT  COPILOT  THRUST GRIP PLUG. REMOVE PILOT FLOOR PANEL. DISCONNECT Pl- LOT THRUST GRIP PLUG 300P25.  SET  COPILOT  NO.  1  & NO, 2 ENGINE SWITCH TO RPM DECREASE. CHECK FOR GROUND ON TB18 TERM 13. IS GROUND  PRESENT? REPAIR OR REPLACE COPILOT THRUST GRIP. REPAIR OR REPLACE PILOT THRUST GRIP. OPEN RIGHT ELECTRICAL COM- PARTMENT.  DISCONNECT  WIRE W592-28-22   FROM   RELAY 103K2 TERM X 1. CHECK FOR NO REPLACE RELAY 103K2 GROUND ON WIRE. IS GROUND PRESENT? LOCATE GROUND FAULT ON WIRE    W592-28-22,    W639-325- 22,   W696-49-22   OR   W696-44- 22  BETWEEN  RELAY  103K2, TB18 AND RECEPTACLES 300J25   AND   300J26.   REPAIR OR REPLACE WIRE AS RE- QUIRED, REPLACE NO. 2 ENGINE CON- TROL   BOX   103A2. LOCATE  GROUND  FAULT  ON WIRE   W592-41-22   BETWEEN RELAY 103K2 AND PLUG 103P2. REPAIR OR REPLACE WIRE AS REQUIRED. GO TO NEXT PAGE Change  5 4-135