Over night battery runs out, what to do? Engine starting if the battery is dead

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2019-07-05 04:20:29

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Battery is one of the most important parts of the vehicle. He feeds the starter, starts the engine, maintains the running generator, if that alone does not cope with the loads, and ensures the efficiency of some electrical components when the engine is not running (Central lock, alarm, lighting, etc.). But it often happens that the battery or other reasons discharged, and the owner of the car doesn't even know it. Arriving at the garage or Parking place, the driver may choose not to run the motor, but even to get to the salon. We will consider such cases, install them the reasons and try them yourself to understand.

a night around the world.

Features of the modern battery

All battery old model was designed for a particular service. Instead of the ability to be serviced, a new battery has got more life. Modern battery under the condition of normal use can work without any service from 3 to 5 years. The old model had a tube in each of the cans, whereby the owner could set the amount of electrolyte in them, and its density, as well as visually to determine the condition of the plates. New batteries are generally maintenance-free, i.e., disposable. They have a closed housing, which define the density and amount of the electrolyte impossible. Having fulfilled his sentence, such a battery is beyond repair or recovery, it can only be put in special collection points.

Why the battery runs out

But whatever the battery, one day it will show its weaknesses. And don't have to wonder if after a few years of excellent work you will find that in your car over night battery runs out. The reasons for this may be several:

  • Battery simply worked out;
  • The generator is not charging;
  • There was a leakage current;
  • One or more devices are permanently enabled.

New batteries

Another Possible cause – extended downtime at low temperatures. If you got the battery in the cold, it should just be put in a warm room, to give a few hours to warm up and charge.

Old battery

If the battery worked more than five years and gradually ceased to hold a charge, then nothing will help. Usually the problems start with the onset of frost. If you got the battery in the cold, it is advisable to go for diagnosis. It happens that in extreme cold, the electrolyte, which because of its old age has lost its density, freezes, bursting the banks of the battery.

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If your old battery is serviced, it can ‘to bring to life”, topping up of the electrolyte and its munitions, but I doubt it will last long, especially in winter. Better to buy a new battery and forget about this problem for a few years.

got the battery in a frost

No charge

If over night the battery sits, who has worked quite a bit, an urgent need to establish and eliminate the cause. Start with generator, it does not need any special knowledge in the field of electrical engineering. On the dashboard of all cars there is a light that lights up when the battery is not getting charging. If it burns when the engine is running, immediately go to the service.

Leak current

When the night goes down the battery, there is a need to test the system for leakage current. To define it, having the skills to operate the ammeter, it is easy, harder to find where the leak itself.

Remove the negative terminal from the battery. Ammeter or multimeter in ammeter mode to measure current between negative battery terminal and the removed terminal. If the measure of leak is above 80 mA, it is a problem and a signal that an urgent need to go to the service station for locating leaks and Troubleshooting.

start the engine if the battery is dead

On devices

Sometimes it happens that after leaving the car for a long time, we forget to turn off the dimensions, radio or other appliances that, operating continuously, lead to the fact that the car battery sits. If this is the exception rather than the rule, there is nothing wrong here. Simply recharge the battery and it will work again as usual. But sometimes we do not even suspect that somewhere, for example, in the trunk, maybe not continuously, to burn the lamp.

To Determine this you must look into a closed trunk from the cabin. If lighting is included, it's time to replace the faulty brake light sensor.

Signs of a dead battery

To avoid problems with starting the engine on the road, you need to pay attention to the condition of the battery. If it is accepted, should at least once in three months to check the electrolyte density. This is done using a hydrometer – a special device, resembling a large eye dropper with scale and float. With it made a fence of the electrolyte, and the float indicates the density. Charged battery should have a density not less than 1.12 g/ml, discharged half – 1.2 g/ml, and a fully exhausted battery – less than 1.28 g/ml.

Maintenance-free batteriesequipped with special alarm device – a lamp. If the battery is charged, it always lights green in case of discharge – red.

If you got the battery in the car

Battery is dead: how to open the car

But what if the trouble has already happened? You came to the Parking lot, press the button on the key FOB, and the lock does not respond? Well, if there is a conventional key and lock cylinder in the door. But in some modern cars the key as such is generally not provided.

If you got the battery in the car with the electronic key, and you can't even get to the salon, don't panic. No need to break glass and try to break the door. Try to get a different charged battery and a couple wires with a length of 1.5-2 meters. Then the car will need poddomkratit so that it was possible to remove some of the protection Carter in the place where is located the starter or alternator. When the protection is released, connect the positive wire from the battery to the positive terminal of the starter or generator, and minus connect with any element of the car body. When the wires are connected, open the car with key FOB. As you can see, to get into the car is not so difficult, but now to start the engine if the battery is dead?

How to start the engine when your battery is low

If you are trapped in the cabin of the car, but the battery does not have enough to start the engine, have to use alternative methods to start it. Engine starting if the battery is dead can be accomplished in several ways:

  • Remove the discharged battery, charge it and start the engine;
  • Start (“light”) engine with a special high voltage cables from another battery or vehicle;
  • Start the engine by way of towing or pushing the vehicle (of course, if you do not have automatic transmission).

battery is down how to open a car

How to charge the battery with the charger

If you have a charger for the battery and time to charge it, remove the battery, disconnect first the negative and then the positive terminal. Bring her into the room, open your tube of cans, check the amount of electrolyte (if battery is serviced) and if necessary, add it. Connect the terminals of the charger to the battery, observing polarity. Connect the charger and set the desired charging current. It needs to be equal to one-tenth of the battery capacity, ie, if the battery capacity is 55 A/h, the charging current should correspond to 5.5 A, if 60 A/h – 6 And etc. Charge the battery until its time for the needle of the ammeter will not show “0”.

Start a dead battery from another car

When there is no opportunity or time to charge the battery in the traditional way, you can try to start your car with “lighter” of the high voltage cables and another car. For this machine you want to install the hood to the hood so that the length of the cable was enough to connect the terminals of the battery. The connected battery of both cars in parallel (minus to minus, plus to plus). Start the engine of the other car. Wait 3-5 minutes for your battery to recharge a little. Then we start the engine of your car. Usually this method works in 100% of cases, unless there are no other problems.

Starting the engine by towing or pushing

This method can be used only on vehicles with a manual transmission. To start the engine, need to get another car took us in tow. A little to disperse the car in neutral, turn the ignition on, squeeze the clutch, turn on the 3rd or 2nd gear, release the clutch. As soon as the engine starts, you need to squeeze the clutch, turn off the transmission and stop the tow. The motor should not immediately turn off, let it run for 20 minutes, and even better to drive this time so the battery has received some charge.vehicle Battery low

When pushing you will have to put a lot of effort and involve several people. Engine starting also is from 2nd or 3rd gear.

The Effectiveness of methods of towing and pushing is not as high, however, in most cases, the motor still fails to run. But as the battery runs out, and this happens every day, you will agree that the best solution would be to purchase a new battery.

Is it Possible to charge battery without charger

And what about when there is no way “light”, neither to push nor to charge with the charger? What to do if you got the battery in the car, and you have no one to help? In this case, can help a normal network adapter from the laptop. This method is quite risky, because most of these adapters give output current of 2.5 A. because Of this, there is a possibility that he simply burned up, unable to withstand the oncoming current of the battery. And to charge is very long. But if there is no other alternative, will have to try.


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Alin Trodden - author of the article, editor
"Hi, I'm Alin Trodden. I write texts, read books, and look for impressions. And I'm not bad at telling you about it. I am always happy to participate in interesting projects."

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