Battery light on: inspection of malfunctions, their cause and repair

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In the moment of starting engine, several indicators on car control panel on. We’ll talk about engine and accumulator oil pressure. After the engine is started, both indicators switch off if the car is intact. But there are cases, when those indicators on control panel constantly on. So, what’s the problem?

• What happens, when the battery light on?
• Inspection of malfunctions and its causes
• Malfunction repair
Battery light on: inspection of malfunctions, their cause and repair

What happens, when the battery light on?

To solve this problem you must know the principle of interaction between automotive alternator and battery pack. While the car is on the move, the battery recharges under straining of 13.6-14.2V. When the engine runs up, the alternator straining grows. It is impermissible. To measure the voltage, small regulating relay is embed in rotor impulse circuit. It normalizes a current rate even under engine boost rpm. Keep the charge voltage of the battery maximum stable. If the battery light on, then there is no alternator charge.

How does this scheme work? After ignition started through precooler, the voltage is applied to battery charge control lamp. In-phase voltage grows with the rotor speed. As a result, the tension in indication lamp of the batter is equalized then it goes out. During this process the battery charges.

Inspection of malfunctions and its causes

There are many reasons for battery indicator light on for a long time. This happens when:
• Weakens tension of the alternator belt, also it wears out and fails.
• The precooler deflagrates or the mounting pack contact quality goes down.
• The control relay, diode bridge and additional diodes are broken.
• Abruption in field leads.
• Lowers the contact quality of battery terminals and alternator output.
• Alternator panels wear out.
• No quality contact of mass wire.

Battery light on: inspection of malfunctions, their cause and repair

Malfunction repair

Begin with battery terminals voltage measuring while engine on. Don’t remove holding-down clips. Under normal regular charge, the voltage must be 13.6-14.2V. If there is no charge, its level will be much lower, appr. 12V.

To rectify this problem, you must prepare following tools:
- 12V indicating lamp;
- couple of screw drivers: flat and cruciform;
- multimeter;
- small knife;
- pliers;
- flint-paper.

Battery light on: inspection of malfunctions, their cause and repair

Let’s start:
1. Board voltage meter shows, that the charge is normal, signal indicator on control panel is off, the battery is almost starve and its terminals have the charge nearly 12V. In this case you must clean out wire bindings on power source. If those actions are useless, then measure the voltage level on terminal directly.

One multimeter dipstick must tig the terminal, another one - the mass. If the voltage here exceeds the one in battery, then clean up the terminal №30. Replace the wire coming from battery to alternator, if necessary.

2. The battery indication lamp and voltage meter that the charge is present but the battery discharged. The charge is within normal level – approximately 14V.

The charge arrow jumped left because of increased load on electric mains. The main cause of this is easy tension of alternator pulley belt. It is better to adjust it or replace, if necessary. This may be caused by one of the diodes breakdown or phase stator winding failure.

Turn off the ignition and check the diodes with multimeter. Replace them if they are damaged. Check the alternator panels by obtaining them and measuring their length. If it does not exceed 5mm, they must be replaced.

Battery light on: inspection of malfunctions, their cause and repair

3. Battery signal indicator does not switch on by key turn in the lock. The charge sensor does not activate and the battery is discharged. The cause is precooler blowing. It is marked as F10 with value of 10A. Install a new precooler. If it didn’t help, the problem might be in the lock or in ignition relay.

4. No charge after the ignition is started up, but all components are functioning and tell tale is off. The inspecting process is easy. You must remove the wire from alternator terminal №61 and connect it to automotive body directly, that means to negative side. If the lamp is on, then the problem is in alternator drive winding. The second option is poor connecter contact. If there is no result even after cleaning up, then, perhaps the lamp burnt out.

5. The charge indicator is on even after starting the engine. And there is no charge or it appears intermittently. The problem is in insufficient control panel wire contact. It may oxidize.

And the last thing, you can inspect a regulating relay. To do so, energize it from battery. If there is 12V, then the relay is intact. If not, then you must replace it. If you have troubles with battery recharge, then you should check all options mentioned above. Usually, the failure “lies above” and its cause is poor contact, burnt out lamp or broken relay.

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