Car has parasitic battery drain.

Something is draining my battery when the car is off. There is also a gas leak by the carburetor.
Experienced mechanics share their insights in answering this question :
I would have a technician such as one from YourMechanic do a parasitic drain test on the battery. This is where you connect a amp meter to the battery and pull out fuses until the drain stops to determine where the drain is coming from. Sometimes, it may be something like a light switch inside the car that is staying on. It also may be a glove box or a trunk light that has a bad switch.

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Electrical devices or lights left running, a defective charging system or alternator, and extreme weather are some common reasons but maybe it`s just time to get a new battery.”
Several things could be causing problematic parasitic battery drain, including short circuits or electrical devices that remain energized, including: Under-hood or glove-compartment lighting. Headlights. Computer module.
Whenever you have a completely dead battery, there is no way of reviving or fixing it. You must replace it.
Issues such as faulty wiring, bad fuses or interior lights that fail to shut off will continue to drain your battery while it`s idle.
What may drain a car battery when it`s off are things such as interior lights, door lights, or even bad relays. While your engine runs, the alternator recharges the battery — which is why you typically don`t have to worry about the battery dying while you`re blasting the radio on your drive to work!
The normal parasitic drains refer to the energy supplied by your car battery to certain components in your car to keep them running even after you turn off your car. These components include your security alarm, radio presets, and clock.
If the parasitic draw is 60 milliamps, that means it will discharge the batteries at a rate of 1.44 Ah per day (. 060 x 24 hours).
Start by connecting a digital multimeter to the negative battery terminal of your vehicle. Then, remove the fuses one at a time while watching for changes in the multimeter`s reading. Once the reading drops, you`ve found the culprit and can take steps to repair it.
If it is slowly losing power with electronic problems, trouble staring the car and other signs of battery failure, then it may need to be replaced because a recharge might not last that long. If it is just completely dead through no fault of your own, then it definitely should be replaced.
12.0 volts or below – At 12.0 volts your battery is considered to be fully discharged or `flat` and should be recharged as soon as possible.
If the parasitic draw is 60 milliamps, that means it will discharge the batteries at a rate of 1.44 Ah per day (. 060 x 24 hours).
Battery drain or dead battery

A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.

If the parasitic draw is 60 milliamps, that means it will discharge the batteries at a rate of 1.44 Ah per day (. 060 x 24 hours).
Can a parasitic drain ruin a battery? Yes, excessive parasitic drain can ruin a 12V battery over time by continuously draining its charge and shortening its lifespan. Frequent drains can also lead to sulfation buildup on the battery plates, further reducing the battery`s capacity and performance.
Some check parasitic drain directly at the battery with a digital ammeter and a test switch. Others do it by clipping an inductive current clamp around a battery cable. If the drain is excessive, the most common way of isolating the cause is removing one fuse at a time.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Water was spilled in the trunk which soaked the car battery. Car won’t start now. Does water destroy a car battery?
ANSWER : Hi, thanks for writing in about the concern with the BMW 320i. If the battery was submerged in water then it’s completely possible for the battery to short out and die. Your friend will need to have the battery replaced. Also be sure to get all of the water out of the trunk. Have a certified technician, like one from YourMechanic, help you guys out if you need assistance with replacing the battery. Good luck.

Car didn’t start this morning, do I need a new battery or did I drain my battery? (although I can’t seem to think of how I did?)
ANSWER : Hi there!

First off, don’t worry about being a new car owner – everybody has gone through this same situation at least one time in their lives. When the radio or other accessories are turned on while the engine is not running, the power is drained from the battery. If it’s too long, it can cause the battery to prematurely wear out. However, since your vehicle is a 2010, it’s possible that the battery was on it’s last legs as it was. Usually when the car starts, the alternator charges the battery. But if the battery is worn out or old; it usually means the battery needs to be replaced. We have several professional mechanics from YourMechanic.com who can complete the battery installation for you.

Battery drained and car key couldn’t open car door.
ANSWER : Hi there. The battery is draining for a parasitic load applied to the battery over night. This will drain the battery to needing a charge or needing a replacement. If the alarm was installed and it was for a newer vehicle, as long as the wiring is correctly installed into the vehicle, the year of the alarm should not matter. The alarm was probably installed on the wrong circuit causing the other circuit to have a load applied to it when the key is turned off. I recommend disabling the alarm and see if the battery does not discharge. If so, then hook up the alarm to a different circuit isolating it from any other circuits. If you need further assistance with your battery draining, then seek out a professional, such as one from Your Mechanic, to help you.

When changing the car battery, do you "register" the battery to the car computer?
ANSWER : Hi there. Changing the battery has nothing to do with programming a battery. If the car was flat dead with a battery that lost all of the power because the dome light was on, then when jumped the vehicle will run fine. What may need programmed when the battery is replaced is the key fob. The key fob will lose programming to the computer as the vehicle computer is reset. However, if a 9 volt battery saver was put into a cigarette lighter and the car battery was removed, then the computer will not lose its memory and be just fine. If you need further assistance with your battery, then seek out a professional, such as one from Your Mechanic, to help you.

Can disconnecting your car horn cause your car battery to drain over night?
ANSWER : A horn being disconnected will not cause the battery to get drained. The battery being drained or low on charge after sitting should first charge and test the battery then check to see if the vehicle has a draw on the battery. There is a possibility that the alternator is drawing the battery down and should be tested by a mechanic like one from YourMechanic.

My car will not start Intermittently. I purchased a new battery 2 weeks ago and yesterday the car wouldn’t start. Got a jump and
ANSWER : The issue you are having is probably due to an intermittent fault in the starter motor itself or a deficiency in the starter electrical circuit, for example a large voltage drop due to a poor ground or a high resistance connection. These issues can be readily diagnosed and resolved on a mobile basis if you request a hard starting diagnostic. If you request that diagnostic, the responding certified mechanic will get this resolved for you promptly. Based on Toyota’s Factory Service Manual, the battery should not be disconnected if the vehicle engine is running. The battery acts as a large resistive voltage sink and consequently taking the battery out of the circuit, while the alternator is still running, can create a voltage spike on the car’s electrical system which is not good for voltage sensitive components such as the engine computer. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Battery drains quickly, New battery,Heavy drain, Replaced alternator , drain still there,goes away when bat. main 2 fuse is pulled
ANSWER : Hi there. It’s quite possible that you have one of two things causing the drain to the battery. First, you have a bad ground somewhere in the main relay or fuse box or an exposed wire somewhere that is not allowing the circuit to complete from the alternator to the battery. This can cause a battery draining issue as you’re describing, but it could also be one of multiple other electrical problems. The best way to pinpoint the exact source is to have a professional mobile mechanic come to your location and complete a battery will not hold a charge inspection.

Battery light stays on and overnight battery drain. 2006 Land Rover LR3
ANSWER : Hi there – yes, something is going on here that’s draining your battery. Perhaps the pressure of the engine wash dislodged wiring which has shorted, or there was a chemical reaction to the cleaning solution that caused electrical damage in the alternator or voltage regulator. These componnents can be checked off of the vehicle. Vehicle wiring can be diagnosed by connecting an ammeter to the positive (red) battery cable, observe the current drain (likely less than 1 amp), then, one at a time, remove each fuse, check to see if the current drain has dropped to near 0, then reinsert the fuse. This process should identify the faulty circuit in most cases. The specific components on that circuit can then be checked for current drain problems. A professional mechanic, like YourMechanic, can come to your location, and perform this procedure for you, and replace/repair the failing component.