How to test a car battery with a multimeter is a common question asked by most of the motorists. Amazingly, the answer to this question is very easy and if you want to learn then read the article in detail. Moreover, don’t forget to see the following video, it also helps you to check your car battery condition with a multimeter or hydrometer.
- 1 Test your Car Battery with A Multimeter
- 1.1 Find the Battery
- 1.2 Multimeter: an ally that he must have!
- 1.3 Adjust the Multimeter
- 1.4 How to Proceed?
- 1.5 Interpret Recorded Voltage Measurements
Test your Car Battery with A Multimeter
You need to follow the steps which are going to be mentioned below;
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Find the Battery
It may sound a bit silly but a lot of drivers don’t know where it is! While the majority of cars accommodate it in the engine compartment, some others have integrated it into the trunk.
Multimeter: an ally that he must have!
It is everywhere, it is cheap and will serve you for many other things than to test a battery: it is the famous multimeter. It can measure amperes and voltage on an electrical circuit. Here it is the voltage of the battery that interests us.
Adjust the Multimeter
First of all, if you buy one for this test, think about buying the battery that goes with it … In fact, as this is usually a 9V square stack, it is unlikely that there will be one left behind in your home. I’m just saying that because that’s what happened to me.
Two things to know, we need to get to the DC voltage position. Then you have to calibrate the voltage measurement on the multimeter: set to 20 Volts because this is the best match to what you want to measure (around 12 Volts). Be careful though because if you choose too small, you will be able to click the multimeter fuse
How to Proceed?
First of all, it is better to measure when the car is cold because if it has just rolled the load may be higher (since the generator lu sent power only a short time ago).
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Turn the multimeter on in the voltmeter position with the settings shown above. Then simply connect the voltmeter terminals to those of the battery by respecting the color code (the + and the – ).
Interpret Recorded Voltage Measurements
The voltage is less than 11 Volts
The battery is extremely discharged and there is the risk that it will never fully recover from this situation. Sometimes electrolysis must be replaced when possible (access by caps on the top of the battery).
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The Voltage is Slightly Less Than or Equal to 12 Volts
The battery is flat but it still has vital forces to be able to start again on the right foot. However, it is necessary to do quickly because in this state the battery degrades quickly and irreversibly (unless replacement of electrolysis).
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The Voltage is Higher Than 12 Volts
It has some juice but knows that it is recharged at 100% only when it is at 12.6 Volts minimum (up to 13.5 grand maximum). If for example, it is at 12.1 Volts, the charge will be about 20%. Has 12.3 Volts 50% 12.5 Volts 85% etc …
The Voltage is Higher than 14 Volts
Be careful it is too charged. The governor of the alternator which is to limit the overvoltages must be out of service.
I hope, you will get the answer of how to test a car battery with a multimeter. If you have any other question please ask in the comment section.