TM 10-3930-659-20 Table 4-2.  Electrical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2. Check starter motor solenoid for sticking by lightly tapping starter motor solenoid. If starter motor solenoid is sticking, replace starter motor (see paragraph 6-3). 11.  ENGINE STARTUP PRODUCES EXCESSIVE NOISE. Remove starter motor (see paragraph 6-3), and inspect starter motor pinion gear teeth and flywheel gear teeth. If pinion gear is frozen or teeth are damaged, replace starter motor (see paragraph 6-3). If flywheel gear teeth are damaged, notify Direct Support Maintenance. 12.  ENGINE STARTING AID IS NOT WORKING. WARNING Starting  fluid  is  toxic  and  highly  flammable.    Container  is  pressurized  to  act  as  an  expellent. DO NOT heat container and DO NOT discharge starting fluid in confined areas or near an open flame.  Failure to follow this procedure may result in serious Injury to personnel. Step 1. Check for empty engine starting aid cylinder by removing engine starting aid cylinder (see para- graph 5-20) and shaking it. If engine starting aid cylinder is empty, replace engine starting aid cylinder (see paragraph 5- 20). Step 2. Check engine starting aid circuit fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). Step 3. Test for 24 v at engine starting aid valve wiring harness connector (see paragraph 2-27). Replace damaged engine starting aid valve (see paragraph 5-19). Step 4. Check engine starting aid switch for continuity when pressed (see paragraph 2-27). Replace damaged engine starting aid switch (see paragraph 6-53). Step 5. Check engine starting aid circuit within engine wiring harness for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged engine wiring harness connectors (see paragraph 2-28). Replace damaged engine wiring harness (see paragraph 6-59). 13.  FUEL GAGE IS NOT WORKING. Step 1. Check fuel gage fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). 4-29