First Quarter Examination - Automotive Servicing 12

Part I: Service Automotive Battery

• Primary function is to store electrical energy for the starting system.
• Battery cells are responsible for producing electricity.
• Most common symptom of a failing battery is an unresponsive starter.
• A fully charged battery reads 12.6 volts.
• Common maintenance practice includes cleaning terminals for optimal contact.

Part II: Service Ignition System

• Main function of the ignition system is to ignite the air-fuel mixture in the cylinders.
• The distributor distributes high voltage to the spark plugs.
• Malfunctioning ignition coil typically results in engine misfires or stalling.
• Signs of a failing spark plug include difficulty starting the engine.
• A timing light is essential for testing ignition timing.

Part III: Test and Repair Wiring/Lighting System

• The purpose of a fuse is to prevent electrical overload.
• The most common cause of a blown fuse in a lighting system is a short circuit.
• Test for a short circuit using a multimeter to measure continuity.
• Flickering or non-working headlights indicate a wiring problem.
• A faulty ground connection can be identified by testing with a voltmeter.

Part IV: Service Starting System

• The main component of the starting system is the starter motor.
• A failing starter motor is indicated by the engine turning over slowly or not at all.
• A malfunctioning starter relay prevents the engine from turning over.
• A voltmeter is typically used to test the starting system's electrical circuit.
• Checking battery voltage is the first step in diagnosing a no-start condition.

Part V: Service Charging System

• The primary function of the alternator is to charge the battery and power the electrical system.
• The voltage regulator regulates the output of the alternator.
• Rapid battery discharge is a symptom of a failing alternator.
• Use a multimeter to test the output of an alternator.
• Recommended maintenance for the charging system includes cleaning battery terminals and other component terminals.