1997 grand marquis has same problem Tonight I found the head and tail light and interior light on. Light switch was in automatic on/ off. Key was off. Turned off Light switch from auto to off and lights went off. twice in the past week have had dead bat in morning. Hope that it is fixed.
check and make sure it is charging the battery, should be between 13 and 14 vlots when car is running. if less you have a wire not getting power from the alternator to the battery.
If you have power windows, try checking the wiring and motor for that. When a power window motor is bad or the wiring has a short in it, it can run continuously even with the car off causing the battery to be drained. If that checks out fine, check other automatic devices in your vehicle. There are a number of them that could be malfunctioning and be absorbing too much power from the battery. a little.
Somewhere in the car is a load that is killing the battery. If you have had any electical work done recently you should be returning to have it looked at. It could be a bad motor somewhere (antenna motor, window motor, blower motor). You can disconnect the negative terminal from the battery until you get it fixed. It won't hurt anything.
Hi That is telling you that the alternator is not charging the battery, and unless you get it seen to very soon (and I mean tomorrow) you will be sitting somewhere with a dead flat battery calling AAA for a ride home. Could be a bad alternator or it could be that the battery is clapped out. A battery needs to be replaced every 3-4 years coz they take such a beating, especially if you live anywhere there's a winter. They don't have an unlimited life span and they are a lot cheaper than an alternator. Auto Zone or Pep Boys will test your battery for free Phil
The battery is only a storage device. The alternator replaces the electrical energy that the battery uses every time you start the engine and every time you turn on an electrical device in the car. If the alternator isn't working or isn't working properly, the battery will eventually discharge. Answer if the alternator is in fact working but you have let the battery run empty, simply getting a jump start might not allow the battery to charge sufficiently once you start driving again. you have to charge the battery up a sufficient amount or the battery will just run out again.
This is an easy answer. The alternator is hooked (through wires blue and black) to the battery. So every time you start an engine the alternator kicks on and charges the battery. That's practically how it works. <><><> To add a bit to the above- an alternator produces an alternating electrical current (unlike a generator, which produces a direct current- DC vs AC) On modern cars, the alternator produces the current used to charge the battery, and operate electrical equipment on the car, such as lights, wipers, radio, etc.
Dead cell in the battery or something is on pulling power from the battery. Examples are, trunk, under hood, glove box, brake, or dome light. Most likely the alternator is not charging the battery and would cause battery failure within 2 days of driving. A vehicle that sits with a constant drain (not including lights) will take over a week to drain the battery. I am sure the owner of the vehicle would know if the lights were on or not. I beg to differ. If the under-hood, trunk, or glovebox light is on the owner would never know this. If the alternator were not charging the battery the red charging system light would be on, which I am sure the owner could easily see. Not to say the alternator cannot be defective if the light is burnt out. A battery with a dead cell will run down overnight every time. Also a trunk or or other under-hood light can easily run a battery down if it is not a very strong fairly new battery. But a defective alternator is not out of the question as it can be strong enough to not turn on the charging system warning light, but weak enough to not keep the battery fully charged. Easy to check the output of the alternator. If you read 13.5 to 16 volts at the battery posts with the engine running the alternator is more than likely good. Less than that or more than that and the alternator is defective.
Several potential reasons that your battery is not charging. It could be that your battery is too old and must be replaced. Alternatively, the electrolyte in your battery is low and that you have damaged your plates by not replacing the lost fluid with distilled water. Thus, you may have to replace your battery. Or, as you suggest, it could be a defective alternator (actually voltage regulator in the alternator). However, first you should check the belt your alternator runs off. If may be loose, causing the alternator not to charge the battery. Old belts develop multiple microcracks that will loosen the belt tension. Have you replaced your alternator belt since you purchased the vehicle (about every 50,000 miles)? If your belt is tight, it could be that your alternator is bad. Brake light could be related to alternator issue, or you have a separate problem with the brake fluid sensor. Remember to check your brake fluid at least monthly. Hope this helps.
A battery that is brand new often sits around for many months before being purchased and can be in an uncharged state when you purchase it. If you don't use your car for long trips in order to give the battery a good charge or if you don't use your car every day or if you live in a cold climate, it could be that your new battery is just not having an opportunity to fully charge. It could also be caused by a faulty alternator or a voltage draw. If you take the car for a long drive (2+ hours) and still have problems, have the alternator and electrical system checked.
An alternator is the part of an automobile that generates the power to run the radio, headlights, speakers, and air conditioning as well as any other electronic component in the car while the engine is running. This is different from when the engine is not running. When the engine is not running, the 12 Volt car battery operates these electronics. Unfortunately, every battery will die eventually, so the alternator also recharges the battery while the engine is running. This is a slow process, though. But unless the battery is charged, the engine usually can't ever be started.
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