Preparing for the test
1. Turn the ignition key to position «OFF».
Note. In order to pinpoint a fault at the connections, make sure that both outputs or their connections are not disturbed during the test.
2. Connect a digital voltmeter to the terminal «IN» generator and terminal (+) battery. Connect wire (+) voltmeter to output «IN» generator, and the wire (–) voltmeter - to the terminal (+) battery.
Conditions for the verification
Read the voltmeter reading with the engine idling and the alternator loaded (headlights, heater fan, etc.).
Analysis of results
Normally, the voltmeter should show a nominal voltage of 0.3 V.
If the voltage drop is greater than 0.3 V, then the cause is most likely a wiring defect.
Pic. 7.10. Generator Wiring Test Diagram
Check wiring from output «IN» generator through the fusible link to the terminal (+) battery (pic. 7.10).
Check the condition of the wire insulation (no signs of overheating) and contact in connectors. Repair defects, then recheck.
After completing the test, turn off all consumers (headlights, heater fan, etc.), then turn off the ignition.