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CHARGING SYSTEM ENGINE ELECTRICAL 16-10 REGULATED VOLTAGE TEST M1161001100666 Required Special Tools: • : Diagnostic Tool (MUT-III) • MB991824: V.C.I. • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A • MB998467: Alternator Harness Connector This test determines whether the voltage regulator is WARNING Battery posts, terminals and related acces- 1. Always be sure to check the following before the test: • Alternator installation • Check to be sure that the battery installed in the vehicle is fully charged. (Refer to GROUP 54A, − Battery − On-vehicle Service − Battery Check • Alternator drive belt tension (Refer to GROUP 00, General − Maintenance Service − Drive Belts (For Alternator, Power Steering Pump and Air • Fusible link • Abnormal noise from the alternator while the engine is running. 2. Turn the ignition switch to the "LOCK" (OFF) position. 3. Disconnect the negative battery cable. 4. Use the special tool (Alternator harness connector: MB998467) to connect a digital-type 5. Connect a clamp-type DC test ammeter with a range of 0 − 120 A to the alternator "B" terminal output wire. 6. Reconnect the negative battery cable. 7. Connect an engine tachometer, or diagnostic tool. 8. Turn the ignition switch to the "ON" position and check that the reading on the voltmeter is equal to NOTE: If the voltage is 0 V, the cause is probably 9. Check to be sure that all lights and accessories are off. 10.Start the engine. 06DB025A BATTERY IGNITION SWITCH AMMETER (CLAMP-TYPE) LOAD MB998467 VOLTMETER (DIGITAL-TYPE) RED YELLOW ALTERNATOR B ALTERNATOR MALFUNCTION LIGHT COMBINATION METER L S |