If her Nissan Sentra’s battery irradiate is on, it way a few things. That is trying come warn you the there is an issue with the charging system. The charging device itself is reasonably simple. It’s nearly always going come be led to by a bad battery or alternator.

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The battery light comes on when it detects the the voltage in the battery is as well low. Many battery lights will certainly come on as soon as the car starts if the computer has detected that the voltage was also low for a high quality start. V an older battery, you will certainly often notice this on the very first truly cold work of the year.

You may have actually noticed your Sentra struggling come start, and also then the battery light remains on ~ the start. The would indicate a bad battery, but it’s still worth her while to have it tested first.


Nissan Sentra Battery light Causes

The charging device in vehicles hasn’t adjusted that lot in the last 50 years. The engine turns the alternator, i m sorry charges the battery. There isn’t a lot to it, which provides diagnosing it relatively simple.

1. Battery

The battery is mainly there to start your Sentra. It can run turn off the alternator simply fine once it’s started. This is vital thing come know. A negative battery usually renders itself recognized when you are trying to begin the vehicle.

2. Alternator

A usual alternator

A poor alternator will normally make itself known when the engine is currently running. If you watch your Sentra’s battery light turns on while the engine is currently running, that is a strong indication that the alternator is no much longer providing sufficient wattage to strength the various electric systems and charge the battery at the exact same time. A brand-new alternator will certainly rectify the problem.

See Also: Nissan Sentra poor Alternator Diagnosis

3. Alternator Belt

Nearly all modern-day vehicles usage a serpentine belt to revolve the alternator. The serpentine belt turns an ext than one engine accessory (A/C compressor, power steering, etc). If the serpentine belt walk bad, it will certainly no longer be able to turn her Sentra’s alternator enough for the to obtain an enough charge.

4. Battery post Corrosion

The voltage native the alternator is sent out to the battery through a wire that connects to the battery post. If the battery short article is really corroded, it won’t have the ability to do its task of sending the voltage to and also from the battery efficiently, and also your Sentra’s battery irradiate will revolve on.

It only takes a 2nd to examine it out. A battery post cleaner or cable brush have the right to clean it increase in no time. Simply be cautious not to get any kind of of the corrosion in her eye.

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Battery irradiate Diagnosis: Nissan Sentra

You deserve to diagnose whether her Sentra’s alternator is negative pretty fast at home. If you have actually a voltage meter, that’s a terrific place come start.

Voltage Test

The first thing that you’ll want to do is acquire a an excellent multimeter. V a multimeter you do a quick test to check out if your Sentra’s alternator is functioning or not.

The complying with was bring away from bad alternator diagnosis page on this site:

collection the multimeter to check out voltage. Specifically, you’ll require to set it come 20V DC. V your Sentra rotate off, you’ll attach the an adverse side the the meter to the an adverse battery article or wire. Touch the optimistic side that the voltmeter to the optimistic battery wire. V the engine off, girlfriend should gain a analysis somewhere in between 12.0 volts and 12.6 volts. Currently that you have a baseline, it’s time to rotate the engine on. Leave the air conditioner off, and the headlights and also any various other accessories. After ~ firing the engine up, girlfriend should get over 14.2 volts. If you gained 14.2 or more volts, the alternator is charging fine. If that still mirroring in the 12’s, the time to replace the alternator. If it’s creating a voltage level in the 13’s, go ahead and take it right into a components store and also have the tested. It’s most likely bad. Now, assuming the the alternator was creating over 14 volts, go ahead and also turn ~ above the headlights, air conditioner, radio, and also any various other accessory you deserve to think of, and run the very same test everywhere again. If the voltage dropped back into the 12’s, that a very solid indication that your Sentra’s alternator is bad. It’s quiet worth having actually it tested, however be all set to change it.

Battery Test

If the alternator appeared to be charging the battery fine, climate it is time to move on to the battery itself. Us recommend taking it to the neighborhood parts store. Almost all of them will certainly test it for free. If it’s bad, they’ll also install the new one.

Conclusion: Nissan Sentra Battery Light

Your Sentra will operate for a short duration of time turn off of the battery alone. But, if the alternator has actually gone bad, it will eventually leave girlfriend stranded. If her battery light come on as soon as you room on the road, acquire somewhere to have actually it tested as shortly as girlfriend can. If you feel there is something you can add, please leave a comment below. An excellent luck!