Charging system units on vehicles after 1993.
1. Main fuse link FL 2.0L; 2. Fuse IGN 7.5A; 3. Fuse Charge 7.5A; 4. Fuse AM1 (50 A); 5. Fuse AM1 FL 1.25 V; 6. Generator; 7. Fuse AM2 0.3P
Circuit for checking battery charging current
1. Disconnect the wire from terminal B; 2. Ammeter; 3. Generator; 4. Voltmeter; 5. Battery
Examination
1. If the battery charging circuit is faulty, the conclusion about the generator failure should be made only after the following checks.
2. Check the condition and tension of the alternator belt. If signs of wear are detected, replace the belt.
3. Check the generator bolts for tightness.
4. Check the generator and voltage regulator wiring, secure fastening and condition of the connectors.
5. Check the fuse links and fuses. If burnt out, find out the cause and fix it.
6. Start the engine and check the sound made by the generator (a howling or squealing sound indicates bearing wear).
7. Check the specific gravity of the electrolyte in the battery. If the specific gravity is low, charge the battery (this item does not apply to maintenance-free batteries).
8. Check if the battery is fully charged (if the battery section is faulty, it may overcharge).
9. Disconnect the cables from the battery and clean.
10. Check the operation of the indicator lamp relay (on vehicles from 1980 to 1992, the location of the relay is different, see Fig. Installation of electrical equipment relays for FJ60 vehicles, rice. Installation of electrical equipment relays for FJ80 vehicles).
11. Check the battery voltage with the engine off. The voltage should be about 12 V.
12. Start the engine and check the voltage again, which should now be between 13.5 and 15.1 V.
13. Turn on the high beam headlights. If the charging system is working properly, the voltage should drop and rise again.
14. If the voltage is higher than normal, replace the voltage regulator (see subsection 3.4.11).
15. If the voltage is below normal, check the regulator and generator as follows.
16. Connect terminal F (1) on the rear cover to ground, start the engine, read the battery voltage and compare with the standard.
17. If the voltage is higher than standard, replace the voltage regulator.
18. If the voltage is below standard, check the generator (or if you don't have an ammeter, take it to a car service workshop).
19. If you have an ammeter, include it in the charging circuit (see Fig. Circuit for checking battery charging current). If you don't have an ammeter, you can use a current transformer.
20. Bring the engine speed up to 2000 rpm, measure the current with the consumers switched off. Then turn on the high beam headlights and the heater fan (set the switch to the HI position). Measure the current and compare with the values given in subsection 3.4.1.
21. If the measured current is less than the standard, repair or replace the generator.