TM 10-3930-659-20 Table 4-2.  Electrical Troubleshooting. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION ELECTRICAL SYSTEM 1. ALTERNATOR IS NOISY. Step 1. Inspect fan belts for proper tension and defects. Adjust fan belt tension (see paragraph 5-37). NOTE Fan  belts  should  be  replaced  In  matched  sets  even  if  only  one  belt  is  worn  or damaged. Replace worn or damaged fan belts (see paragraph 5-37). Step 2. Inspect alternator for correct alinement and loose pulley. Loosen alternator mounting hardware and aline alternator (see paragraph 6-1). Tighten alternator pulley locknut (see paragraph 6-2). Step 3. With engine running, listen for high pitched whine from alternator. If high pitched whine Is present replace alternator (see paragraph 6-1). Step 4. Remove alternator (see paragraph 6-1) and inspect for worn bearings. Replace damaged alternator (see paragraph 6-1). 2. BATTERY CHARGING INDICATOR REMAINS LIT WITH ENGINE RUNNING (LOW VOLTAGE). Step 1. Inspect fan belts for proper tension and defects. Adjust fan belt tension (see paragraph 5-37). NOTE Fan  belts  should  be  replaced  In  matched  sets  even  if  only  one  belt  is  worn  or damaged. Replace worn or damaged fan belts (see paragraph 5-37). Step 2. Inspect  for  corroded  or  loose  terminal  connections  at  starter  motor,  alternator,  batteries,  ignition switch, or ground straps. Remove, clean, and tighten all corroded or loose connections. Step 3. Check alternator circuit within STE/ICE alternator, starter motor, and fuel injection pump wiring har ness for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged wiring harness connectors (see paragraph 2-28). Replace  damaged  STE/ICE  alternator,  starter  motor,  and  fuel  injection  pump  wiring  harness (see paragraph 6-57). 4-21