TM 10-3930-659-20 Table 4-2.  Electrical Troubleshooting (Con't). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Step 2. Check fuel level sending unit for continuity (see paragraph 2-27). Replace damaged fuel level sending unit (see paragraph 6-52). Step 3. Check fuel gage for continuity (see paragraph 2-27). Replace damaged fuel gage (see paragraph 6-7). Step 4. Check accessory relay within gages, Indicators, horn, and engine hourmeter circuit of right panel wiring harness for voltage and continuity (see paragraphs 2-27 and 6-73). Replace damaged accessory relay (see paragraph 6-12). Step 5. Check fuel gage wiring harness within gages, indicators, horn, and engine hourmeter circuit of right panel wiring harness for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged wiring harness connectors or wires (see paragraph 2-28). 14.  HORN IS NOT WORKING. Step 1. Check horn fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). Step 2. Check horn switch for continuity when pushed (see paragraph 2-27). Replace damaged horn switch (see paragraph 6-41). Step 3. Check accessory relay within gages, indicators, horn, and engine hourmeter circuit of right panel wiring harness for voltage and continuity (see paragraphs 2-27 and 6-73). Replace damaged accessory relay (see paragraph 6-12). Step 4. Check horn wiring harness within gages, indicators, horn, and engine hourmeter circuit of right panel wiring harness for continuity (see paragraphs 2-27 and 6-73). Repair or replace damaged wiring harness connectors or wires (see paragraph 2-28). Replace damaged horn (see paragraph 6-40). 15.  TRANSMISSION OIL TEMPERATURE GAGE IS NOT WORKING. Step 1. Check transmission oil temperature gage fuse for continuity (see paragraph 2-27). Replace damaged 10 amp fuse (see paragraph 6-13). Step 2. Remove transmission oil temperature sender (see paragraph 6-33) and test for internal shorting (see paragraph 2-27). Replace damaged transmission oil temperature sender (see paragraph 6-33). 4-30