2. Replace the generator if the results of its test are negative. See «Generator» In chapter "Car maintenance". If it passes the test, perform the power output test on the vehicle as follows.
Important: You should always check the output power of the generator before assuming damage to the generator from a short to terminal ground "L".
3. Connect digital multimeter (A), ammeter (b) and a columnar carbon variable resistor to the battery (d) and generator (e) car.
Important: Make sure the battery is fully charged and the carbon film resistor is disconnected.
4. With the ignition switch off, check and record the battery voltage.
5. Remove the wiring harness connector from the generator.
6. Turn the ignition switch to the ON position when the engine is not running. Use a digital multimeter to check the voltage at the terminal "L" cable harness connector.
7. The reading should be approximately equal to the specified 12V battery voltage. If the voltage is too low, check the terminal circuit "L" short to ground and open circuit, which can cause a voltage drop. Repair wire breaks, terminal connections, etc. if necessary. follow the paragraph «Charging system» in this section.
8. Connect the generator harness connector.
9. Start the engine at medium idle and measure the voltage between the battery terminals. The reading should be greater than what was recorded in step 4, but less than 15 volts. If the reading is greater than 15 volts or less than what was previously recorded, replace the alternator. See «Generator» In chapter "Car maintenance".
10. Run the engine at medium idle and measure the alternator output current.
11. Turn on the carbon film resistor and adjust it to get the maximum current when the battery voltage is above 13V.
12. If the reading is within 15 amps of the generator rating, then the generator is OK. Otherwise, replace the generator. See «Generator» In chapter "Car maintenance".
13. With the alternator running at full output, measure the voltage between the alternator case and the negative battery terminal. The voltage drop should be 0.5 V or less. If the voltage drop is greater than 0.5V, check the connection between the alternator case and the negative battery cable.
14. Check, clean, tighten and recheck all ground connections.