Battery wont stay charged
1973 Ford Thunderbird there might be a slow draw with the battery when i have the connection hooked up the battery dies so i have to unplug the battery time i get out i have replaced the battery and alternator and it still dose the same thing then i tested the alternator when the car was on and it was reading 12.6 volts
My car has 141000 miles.
My car has an automatic transmission.
Experienced mechanics share their insights in answering this question :
It appears the alternator is providing the correct charge (within range) to the battery at 12.6 volts. This also suggests that the voltage regulator is working properly. You may have a slight power draw coming from somewhere in the car. Try checking things like interior lights, stereo connections, trunk light, under hood light and anything else that may have a small bit of power coming from it that may otherwise get left on when leaving the car overnight. You may also have a grounding issue somewhere as well. If you need assistance, a certified YourMechanic technician can come to your location to perform a battery will not hold a charge inspection on your vehicle and help diagnose this issue.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
A bad battery won`t damage the alternator, but a bad alternator can damage a battery. The car battery simply isn`t made to deliver electrical energy for extended periods, so both components need to be functioning optimally.
A dead or low battery can be caused by a failing alternator. It can also result from additional draw from auxiliary lights, fuses, sound systems, alarms and such.
An effective method to determine whether it`s your battery or alternator that`s gone bad is to connect jumper cables from a running vehicle`s battery to yours. After a few moments, try starting your vehicle. Once it`s started, remove the jumper cables — if your engine stalls, your alternator has probably gone bad.
If you did the installation, use the following as a guide to check your new alternator. Your battery should be one of the first things on your checklist after installing a new car alternator. Any installation guide will say that you need to disconnect the battery before installing the new alternator.
Why Your Car Battery Keeps Dying. While car batteries slowly die over time, high heat, brutal cold, excessive use of vehicle accessories (after-market equipment), and other mechanical issues can shorten the life of even the toughest battery.
Defective charging system – A car battery drains quickly if something called the alternator on your charging system fails to push out enough voltage, ideally between 13.5 – 14.5 volts. In this case, the battery will continue to drain even while the car is running.
Charging problems can be caused by electrical faults in the alternator or voltage regulator, poor wiring connections at the battery or alternator, or a slipping or broken drive belt. Since most late-model import alternators are internally regulated, a failure of the regulator means the alternator must also be replaced.
Your car`s battery holds a charge, but the alternator works to recharge it while the vehicle is on. That`s why you can drive all day long without a problem but leaving the lights on overnight will drain the battery. If the alternator begins to fail, the battery will no longer recharge while the engine is running.
Your alternator is also responsible for charging your car battery while driving. The alternator works by turning mechanical energy into electrical energy. When your engine is on, it powers a drive belt that rests on a pulley attached to the alternator.
Driving around with a bad alternator isn`t a smart idea; as damaged or broken alternators can cause a wide range of problems. They can interfere with your car`s electrical features, make it harder to start the engine, and even cause the battery to drain entirely, leaving you with an utterly unresponsive vehicle.
Excessive charges coming from alternator and car battery can entirely damage the starter systems of the car.
A bad alternator can drain a battery in as little as 1–3 hours, or even while it sits overnight and unused.
Relevant Questions and Answers :
the most relevant questions and answers related to your specific issue
installed new alternator and battery the alternator is charging the battery and the battery is maintaining afull charge but the ba
Hello. If the battery and the alternator are new and if it is verified that the alternator is charging then you have an issue with programming. When you replace the battery on this vehicle the computer needs to be reprogrammed to recognize it and to properly charge it. If this is not done then the computer will not turn on the alternator at the correct times an this battery light will come on. You need to have this programming done by a certified mechanic, like one from YourMechanic, who can come to you to [program the battery into the computer] https://www.yourmechanic.com/services/battery-light-is-on-inspection
Battery light stays on and overnight battery drain. 2006 Land Rover LR3
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.
Battery light stays on and overnight battery drain. 2006 Land Rover LR3
Hello – this problem 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 identify, replace or repair the failing component.
Battery dead truck wont start after alarm being messed with.
With all the playing around, the battery going dead more than once, and it being over 5 years old, I would try replacing the battery first.
After the battery is replaced, lock all the doors and then unlock the vehicle with a remote or door keypad if you have one equipped. Next, using an original key, see if it will start. If it doesn’t then the vehicle may have locked you out. In this case, only a WDS scan tester at a dealer can regain access to the passive anti-theft system for you. Unfortunately this would mean that you’ll need to tow it to a dealer.
If you decide to get this fixed or would like a second opinion on this, get the car looked at by a qualified technician, such as one from YourMechanic. A mechanic can perform these checks to properly diagnose your dead battery and fix it accordingly.
My service charging system battery light is on after replacing my alternator with a brand new one. It is not charging my battery.
Hello, thank you for writing in. Several things may be going on. The installation of the new alternator needs to be verified, focusing on the electrical connections and the drive belt. Make sure the connections are clean, dry, and tight. Make sure the drive belt is routed properly and is tight on the alternator pulley (as it is what powers the alternator). If the installation was fine, you will want to make sure the alternator was not faulty from the factory. It is not common, but these issues have been known to happen. Most automotive parts stores can test the alternator off of the vehicle. If you would like more help with testing, contact our service department to schedule an appointment.
Oil pressure and battery light stay on when ignition is off.
Hello. If this is occurring, then there is a short in the electrical someplace. Most of the time, the issue is in the ignition switch. The switch fails internally and causes some circuits to stay on which will drain the battery. It can also be a short in the harness or in the fuse box but the ignition switch is the most common on this car.
If you want to have this electrical issue checked out, consider having a certified mechanic, such as one from YourMechanic, come to your home or office to inspect the electrical system and suggest any necessary repairs.
Battery is not charging properly
What you are describing is most likely a faulty alternator. The alternator charges the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator pulley. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power. You may also notice a whining sound as a result of the bearings inside the alternator begin to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your charging system.
Has new alternator, new battery when started , motor dies when battery is disconnected…my mechanics are stumped on this
If replacing those particular components did not correct the issue then the next thing I would look at is the vehicle’s voltage regulator. It appears that this engine’s electrical system is equipped with an external voltage regulator that functions, or malfunctions, independently of the alternator. The voltage regulator regulates power from the vehicle’s alternator, and can cause issues with the electrical system when it malfunctions. I would test it to see if it is functioning properly. It is a silver box that should be mounted somewhere in the engine bay, usually on a wheel well. A technician from YourMechanic can come to your home or office to replace your car’s voltage regulator if necessary.