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 2-240          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 ALTERNATOR BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD FROM 18, Page 2-238 GO TO 22, Page 2-242 IS LED 7 “ON”? REPAIR GROUND BODY HARNESS WIRE 57B 19 20 21 VISUAL If this LED is not ON, that would indicate a bad connection to ground. 1.TRY IT 2.VISUAL If these LEDs are not ON, that would indicate a protective control box (PCB)/distribution box malfunction. WITH THE IGNITION SWITCH IN THE “RUN” (ENGINE RUNNING) POSITION, ARE LEDs 2,3,4,5, AND 8 “ON”? REPLACE PROTECTIVE CONTROL BOX/DISTRIBUTION BOX DOES LED 10 MOMENTARILY COME “ON” THEN STAY “OFF”? REPLACE PROTECTIVE CONTROL BOX/DISTRIBUTION BOX VISUAL If this LED is not momentarily ON, 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 BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD POSSIBLE PROBLEMS KNOWN INFO BATTERIES OK IGNITION SWITCH OK HARNESS WIRE 29A OK HARNESS WIRE 29C OK PARKING BRAKE SWITCH OK BODY HARNESS WIRES OK ALTERNATOR BAD LEAD 57B GROUND BAD HARNESS WIRE 2A BAD PROTECTIVE CONTROL BOX/   DISTRIBUTION BOX BAD POSSIBLE PROBLEMS