A) Connect a voltmeter and an ammeter to the terminal "IN" generator.
Note: if you have a tester to check the alternator and battery, connect it in accordance with the manufacturer's instructions.
If there is no tester, connect the following circuit:
- Disconnect the wire from the generator output "IN" and connect it to the negative terminal of the ammeter.
- Connect the wire from the positive terminal of the ammeter to the terminal "IN" generator.
- Connect the positive lead of the voltmeter to the lead "IN" generator.
- Connect the negative terminal of the voltmeter to ground.
Note: Use an ammeter and wires that can measure currents above 120A.
b) Start the engine, wait for the radiator fan to turn on, let the engine run without load at 3000 rpm.
V) Bring the engine speed to 2000 rpm and fix it, turn on the high beam headlights, measure the voltage at the output "IN".
13.9-15.1 V?
- Yes - go to step 2.
- No - disassemble and check the elements of the generator.
2. Check the output voltage. Bring the engine speed to 2000 rpm and fix it, turn on the high beam headlights, rear window defroster, heater fan to maximum power and measure the voltage of the battery.
Below 13.5 V?
- Yes - go to step 3.
- No - add load (radio, rear brake lights, etc.)
3. Measure the current.
Above 60 A?
- Yes - the charging system is normal.
- No - disassemble and check the elements of the generator.
Note: If the light stays on, check its circuit or replace the alternator.