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 2-238           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   BAD ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD FROM 15, Page 2-236 GO TO 19, Page 2-240 WITH THE IGNITION SWITCH IN THE “START” (ENGINE CRANKING) POSITION, DO LEDs 11 AND 13 GO “OUT”, AND DOES ENGINE CRANK? NOTE: LED 11 DOES NOT FUNCTION WITH DISTRIBUTION BOX. CHECK BATTERY VOLTAGE AND CHARGE IF NEEDED 16 17 18 1.TRY IT 2.VISUAL If these LEDs do not go ON, that would indicate malfunctioning batteries. VISUAL If this LED is not ON, that would indicate a glowplugs controller malfunction. IS LED 11 “ON”? DURING GLOW PLUG CYCLING, LED 11 MAY FLICKER. NOTE: LED 11 IS NOT USED WITH THE DISTRIBUTION BOX GO TO D1, Page 2-314 IS LED 8 “ON”? FOR DISTRIBUTION BOX, IF YES, GO TO 18. REPLACE PROTECTIVE CONTROL BOX/DISTRIBUTION BOX 1.TRY IT 2.VISUAL If this LED is not ON, that would indicate a protective control box/distribution box malfunction. TM 9-2320-280-20-1 KNOWN INFO POSSIBLE PROBLEMS ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD 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 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   BAD ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/     DISTRIBUTION BOX BAD