BATTERIES OK LEAD 57B GROUND OK IGNITION SWITCH OK HARNESS WIRE 29A OK HARNESS WIRE 29C OK PARKING BRAKE SWITCH OK BODY HARNESS WIRES OK GLOWPLUG CONTROLLER     OK KNOWN INFO POSSIBLE PROBLEMS DIAGNOSTIC FLOWCHART TEST OPTIONS REASON FOR QUESTION TEST OPTIONS REASON FOR QUESTION TEST OPTIONS REASON FOR QUESTION NO YES NO YES NO YES PROTECTIVE CONTROL BOX/DISTRIBUTION BOX 2-242          Change 1 BATTERIES OK LEAD 57B GROUND OK IGNITION SWITCH OK HARNESS WIRE 29A OK HARNESS WIRE 29C OK PARKING BRAKE SWITCH OK BODY HARNESS WIRES OK GLOWPLUG CONTROLLER     OK ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD FROM 21, Page 2-240 GO TO 25, Page 2-244 WHILE ENGINE IS NOT AT OPERATING TEMPERATURE, IS LED 11 “ON”? NOTE: LED 11 DOES NOT FUNCTION WITH DISTRIBUTION BOX. GO TO D1, Page 2-314 AND BEGIN TEST CHAIN AGAIN IF GLOWPLUG CONTROLLER IS REPLACED 22 23 24 VISUAL If this LED is not ON, that would indicate a glowplug controller malfunction. VISUAL If these LEDs are OFF, that would indicate a malfunctioning alternator or damaged harness wire 2A. ARE LEDs 9 AND 12 “ON”? NOTE: LED 9 DOES NOT FUNCTION WITH DISTRIBUTION BOX. IF LED 12 IS ON, GO TO 27, PAGE 2-244. CHECK ALTERNATOR OUTPUT AND/OR REPAIR ENGINE HARNESS WIRE 2A IS LED 9 “OFF” AND 12 “ON”? NOTE: LED 9 DOES NOT FUNCTION WITH DISTRIBUTION BOX. REPLACE PROTECTIVE CONTROL BOX/DISTRIBUTION BOX VISUAL If this LED condition does not exist, that would indicate a protective control box (PCB)/distribution box malfunction. TM 9-2320-280-20-1 KNOWN INFO BATTERIES OK LEAD 57B GROUND OK IGNITION SWITCH OK HARNESS WIRE 29A OK HARNESS WIRE 29C OK PARKING BRAKE SWITCH OK BODY HARNESS WIRES OK ALTERNATOR OK HARNESS WIRE 2A OK GLOWPLUG CONTROLLER BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD POSSIBLE PROBLEMS KNOWN INFO POSSIBLE PROBLEMS ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD