KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION NO YES NO YES NO YES ALTERNATOR 2-196           Change 1 1 2 3 ARE ALTERNATOR DRIVEBELTS/ SERPENTINE BELT TIGHT AND IN GOOD CONDITION (NO CRACKS, FRAYS, OR GLAZE)? ARE ALL WIRE CONNECTIONS TO ALTERNATOR CLEAN, TIGHT, AND MAKING GOOD CONNECTION? WITH ROTARY SWITCH IN “RUN” POSITION (ENGINE NOT RUNNING), DO YOU HAVE BATTERY VOLTAGE AT ALTERNATOR OUTPUT TERMINAL ? VISUAL INSPECTION, USE BELT TENSION GAUGE/ CHECK TENSIONER POSITION If belts are loose, worn, or if belt tensioner has fully retracted, the belts will not drive the alternator fast enough to recharge the batteries. ALTERNATOR PROTECTIVE CONTROL   BOX/DISTRIBUTION BOX WIRING BELTS VISUAL INSPECTION BELTS OK WIRING ALTERNATOR PCB/DISTRIBUTION BOX Loose or dirty connections can prevent a good alternator from charging the batteries. 1. STE/ICE-R TESTS 67 AND 89     (INTERLEAVE) (Pages 2-740, 750) 2. MULTIMETER BELTS OK WIRING CONNECTIONS OK ALTERNATOR PCB/DISTRIBUTION BOX WIRING The alternator must be connected to batteries to be able to recharge the batteries. CLEAN AND TIGHTEN. IF YOU STILL HAVE A PROBLEM, CONTINUE TESTING GO TO 4 Page 2-198 START TIGHTEN OR REPLACE. IF YOU STILL HAVE A PROBLEM, CONTINUE TESTING GO TO A, Page 2-202 DIAGNOSTIC FLOWCHART NOTHING TM 9-2320-280-20-1