TM 10-3930-671-10 Table 4-2.   Operator Troubleshooting Procedures - CONT. Malfunction Test or Inspection Corrective Action ELECTRICAL SYSTEM (CONT) 20. COLD START SYSTEM DOES NOT OPERATE. Step 1. Ensure master electrical switch is ON and ignition key switch is turned to START (Para 2-4 [b]). If cold start system does not operate, notify unit maintenance. If cold start system operates, problem solved. 21. HORN DOES NOT OPERATE. Step 1. Ensure master electrical switch is ON. If horn does not operate, notify unit maintenance. If horn does operate, problem solved. 22. TRANSMISSION OIL TEMPERATURE AND ENGINE OIL PRESSURE LIGHTS DO NOT OPERATE. Step 1. Ensure master electrical switch is ON and ignition key switch is turned to RUN (Para 2-4 [b]). If transmission oil temperature and engine oil pressure lights do not operate, notify unit maintenance. If transmission oil temperature and engine oil pressure lights do operate, problem solved. 23. BRAKELIGHT DOES NOT OPERATE. Step 1. Ensure master electrical switch is ON and ignition key switch is turned to RUN (Para 2-4 [b]). If brakelight does not operate, notify unit maintenance. If brakelight does operate, problem solved. 4-8