WIS Document: 16739

| | Checking the voltage drop at the positive and negative alternator terminals | 1. | Connector a voltmeter across the battery's positive terminal and terminal B+ on the alternator (insulated side). | 2. | Run the engine at 2500 rpm and apply an electrical load to the alternator by switching on all the lights, for instance. Read off the instrument. | 3. | Connect a voltmeter across the battery's negative terminal and terminal B- (ground) on the alternator. | 4. | Run the engine at 2500 rpm and apply an electrical load to the alternator by switching on all the lights, for instance. Read off the instrument. | 5. | The readings in points 2 and 4 should not exceed 0.5 V. If a higher reading is obtained, check the relevant circuit for shorting/continuity.