- The density of the electrolyte of a fully charged battery at 20°C is - 1.25-1.27 g / cm3
Check the electrolyte level and top up with distilled water if necessary.
2. Check battery terminals, fuses and fuses.
Make sure that the battery terminals are not loose or oxidized, and that the fuses and fuses are in order.
3. Check the condition of the accessory drive belt.
A) Inspect the outer surface of the drive belt (fan drive belt for rear wheel drive models). Make sure that there is no: rubber peeling from the cord on the inner (from the side of the ridges) and outer surfaces of the belt, exposed or damaged cord, peeling of the ridge from the rubber base, cracks, peeling or wear on the sides of the belt and on the sides of the ridges of the belt. Replace drive belt if necessary.
b) Measure drive belt deflection (alternator drive belt and other auxiliary units) with a force of 10 kgf (98 N), as it shown on the picture.
Belt deflection:
- new - 5-7mm
- used - 7-8 mm
Adjust if necessary.
Note:
- term "new belt" used for belts that have worked for less than 5 minutes after starting the engine;
- term "working belt" or "used belt" used for belts that have been running for 5 minutes or more after starting the engine;
- after installing the drive belt, check the alignment of the belt ridges with the grooves on the pulleys.
4. Check fusible links for conductivity.
5. Visually check the condition of the generator wires and make sure that there are no extraneous noises in it when the engine is running.
6. Check battery warning light circuit
A) Warm up the engine to operating temperature and shut it off.
b) Disable all accessories.
V) Turn the ignition key to position "On" ("ON").
The battery discharge indicator lamp should light up.
G) Start the engine. The lamp should go out.
If the conditions are not met, check the test lamp circuit.
7. Check charging circuit without load.
Note. If you have a tester to check the generator and battery, connect the latter in accordance with the manufacturer's instructions.
A) If you don't have a tester, do the following:
- disconnect the wire (1) from terminal "IN" generator (3) and attach it to the negative (-) ammeter output (2), which will be connected to the positive (+) battery terminal (4);
- connect the wire from the positive terminal of the ammeter (2) to terminal "IN" generator (3);
- connect positive (+) voltmeter output (5) with conclusion "IN" generator (3);
- connect negative (-) voltmeter output with ground.
1 - disconnected output wire "IN" generator,
2 - ammeter,
3 - generator,
4 - battery,
5 - voltmeter.
b) Measure the voltage at the generator output and the current in the circuit "generator-battery" at a crankshaft speed of 2000 rpm.
With a current in the circuit "generator-battery" not more than 10 A, the voltage at the generator output must lie within:
- with mechanical voltage regulator - 13.8-14.8 V at 25°C
- for a conventional generator (standard equipment) with electronic voltage regulator - 13.8 - 14.4 V at 25°C
- for high-speed compact generator with electronic voltage regulator - 13.9-15.1 V at 25°C and 13.4-14.4 V at 115°C
If the voltage at the output of the generator with a mechanical voltage regulator is outside the specified limits, then adjust or replace the regulator.
If the voltage at the output of the generator with an electronic voltage regulator is greater than the specified values, then replace the regulator.
If the voltage at the output of the generator with an electronic voltage regulator is less than the above values, then check the generator and voltage regulator by performing the following operations:
Connect terminal "F" generator with ground, start the engine and measure the voltage at the terminal "IN" generator.
If the alternator output voltage exceeds the above values, replace the electronic voltage regulator.
If the output voltage is below the specified values, then check the generator.
8. Check the charging circuit under load.
Bring the engine speed to 2000 rpm, turn on the high beam headlights and set the heater fan switch to the position "HI" ("Maximum").
The current in the generator circuit must be at least 30 A.
If the current is less than 30 A, then repair the generator (see below).
Note: With a fully charged battery, the current in the alternator circuit may at times be less than 30A.