Test your alternator and battery with CDRBeThree

Hello,

To test its battery and alternator with CDRBeThree, do the following:

Connect to the vehicle (ignition on).

Go to monitoring live and look at the battery voltage


1st test, verification of the alternator (petrol and diesel).

With the ignition on, you must have a voltage between 11.5v and 12.3V if your battery is charged.

Start the engine, beware, you can only start the engine in the main menu and in monitoring live.
Check the voltage. It must gradually rise between 13.5V and 14.5V.

Once the voltage is stabilized, accelerate the motor to 3000 rpm stabilized. The voltage must not exceed 14.5V.

Once this test has been carried out, always maintained between 2500 and 3000rpm, switched on the air conditioning if it is not active, the rear defrost as well as the headlights and front fog lights if fitted.

The voltage must remain stabilized between 13.5V and 14.5V.

Let the engine return to idle. The voltage must remain above 13.2V.

You can turn off the headlights and accessories.

If after all these tests, you have a good result, your alternator charges the battery well.


2nd Test, checking the battery:

With the ignition on, you must have a voltage between 11.5V for diesel and between 12.1 and 12.3V for petrol if your battery is charged. This difference is related to the glow plugs.

Turn on the headlights and the rear defrost. The voltage must not drop below 11V for diesel and 11.5v for petrol.

If the voltage drops below these thresholds, this means that the battery is partially discharged.

If you have a voltage below these thresholds then the battery has just been charged. This can be a sign of battery starts to wear out.

Please note, during the start-up phase, the battery can drop to 10V. This is normal.

Another test for the battery is keep the charge.

Read the battery voltage as above without turning on any accessories. Note this tension
The next day or two days later without having used the vehicle, read again. The voltage read must not have varied by more than 0.2V. If the voltage read has a difference of + 1V, either the battery is defective or there is an abnormal consumption while the vehicle is stopped. it is therefore necessary in this case to make a "leak test" before replacing the battery.

Good road.