How long will a battery last with a bad alternator

Dec 06, 2019 · How Long Do Toyota Camrys Last? The average car lasts 8 years. This has no bearing on the Toyota Camry. With regular maintenance, Toyota Camrys can last more than 200,000 miles on the road. According to Consumer Reports, the Camry is the top-ranking sedan to drive if you need a high mileage vehicle. Aug 09, 2019 · Hello, the battery light on my fiance's avenger came on, it has a 2.4L, I checked the main power wire on back of alternator and have battery voltage, also checked continuity between both wires on the plug between the plug and the computer and I have continuity, I had the alternator and the battery tested at advance and they both tested good. Please note, the battery is only used (under normal conditions) to start the vehicle. To turn the engine crank shaft using the starter, the battery must have the amperage (power) to do the job. Once the engine is started, the alternator is the source for all electrical power to the vehicle.

If one did, then the maximum life of any battery would equal the available number of cycles and no battery would last more than 6 to 9 months. Ideally, what you need is a battery (batteries) that will provide the power you require without being cycled (depleted from resting full charge) by more than 20 to 50% before being recharged. May 28, 2019 · A battery that most frequently reaches 50% depth of discharge will last longer than a battery that is often pushed to a greater depth of discharge. However, at the same time, repeated shallow discharge (5-10%) of a deep cycle battery also contributes to shortened lifespans. If it looks like corrosion is the problem, you can remove the battery cables and use a bit of steel wool to clean up the corrosion. If a cleanup solves the problem, great, but if it doesn’t, you may have a dead battery, or a bad alternator. You can check the alternator by simply starting your car and then disconnecting the negative battery cable.

A good analogy for this is to think of the battery isolator as a tap between the batteries and the alternator as a pump feeding the start battery. Once the pump (alternator) fills the start battery to a point (13.2v) the isolator detects this and turns on, allowing the feed going into the first battery to pass onto the secondary battery.

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A battery that seems to be weak or has died may mean your alternator is going bad as well. An alternator can help replenish the battery in your car, but it can’t keep it going indefinitely. This means it’s important to distinguish between a weak battery and a bad alternator. According to Nationwide, there are a few different ways to find out if you’ve got a dead battery or an alternator gone bad. Without starting the car, you can check the battery gauge on the dashboard.

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bad connections in the vehicle electrical system. 5) Chronic undercharging due to a failure in the charging system, usually alternator diodes or sometimes bad connections, voltage regulator, etc. 6) leaving headlights/electrical system on and draining the battery to 0 volts then leaving it sit fully discharged for long periods of time.

Unfortunately this industry standardized testing is not designed nor intended to see how long the alternator can run at full output into a large bank of deeply discharged batteries. In other words, an alternators output rating is rated cold (73ºF to 83ºF) at 6000 shaft RPM and 13.5V.

It depends a lot on how much load you place on the battery, but by the time your headlights dim, you generally don’t have long; maybe two minutes tops. A car with a carburetor will last considerably longer, especially if it also has a mechanical fuel pump. Without a timing belt, about 0.07 seconds at best. cn90 said: In my experience with my 1983 735i years ago, once the alt dash light is up, you have anywhere between 20-30 min. Click to expand... I remember watching a friend in grad school days calmly handle the dead alternator with aplomb. He had to get parts so he borrowed a fresh battery from a roommate's car.

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  1. Sep 18, 2020 · In some cars, it can last for as long as a decade without any necessary repairs or maintenance required if the alternator is still charging. If the alternator does fail, the car can sometimes still run for a limited time on just battery power. However, once the alternator stops charging, the engine will stall and fail. Signs of a Bad Alternator
  2. Thanks for the reply, unfortunately there isn't a marked date on top of the battery, i just bought the car a few months back. I'm thinking either there might be too much corrosion on the inside of the terminals even though i cleaned them pretty well, or my dad suggested the voltage regulator in the alternator.
  3. Until the battery was replaced, the alternator on the Flex was getting cooked as it tried to recharge their five-year old battery and moving closer to an even more expensive alternator replacement. In fact, the alternator likely saw added stress over the last year, as it struggled to maintain voltage in a battery moving closer to being replaced.
  4. Mar 29, 2020 · Many cars can sit for two weeks and still start back up on the first turn of the key. Others will die in under a week. The vehicle, the battery's health, and the environmental conditions all play a...
  5. Yes. Almost all outboards that have electric start and that were built in the last 20 years, will have either an alternator or a stater that charges the battery when the engine is running. At what capacities and loads they charge the batteries is another thing.
  6. Jun 23, 2020 · There will be 24 volts (about 28 volts with an alternator) if two 12-volt batteries are wired together in series: Connect the positive terminal of one battery to the negative terminal of the other ...
  7. Sep 11, 2019 · Now you can find out how long it will take for the battery to reach this value. To do this, subtract the result from the total capacity and divide this number by 0.01. The formula is as follow; 50 A/h-16 A/h=34 A/h; 34 A/h: 0.01 A/h=3400 hours; 3400 hours equals 141 days during which your battery will be able to hold the required charge.
  8. If you bring your load up to 101 amp, then the voltage in the system will drop below 12.8V because the extra 1 amp that is needed and not coming from the alternator will have to be stolen from the vehicle's battery and hence the voltage will start dropping below the static battery level.
  9. If the above steps reveal that the battery is working, it's time to take a closer look at the alternator. There are certain bad alternator symptoms to look for, check for these common signs of alternator problems: While running the car, note the brightness of the interior lights. If the dashboard gradually dims, the alternator is likely at fault.
  10. May 04, 2013 · The battery will have a date stamped on the negative terminal. should read the week and year the battery was made. Depending on how the battery was maintained has a big influence on how long it lasts. Like said above average is 5 years. Also if you do replace it make sure you get it registered to the vehicle.
  11. May 15, 2001 · If everything ran fine before with these mods then I'd suspect the Alternator but the battery might not be holding a charge, 3 years is a long time for an Exide to live. Put it on a charger and see if it takes a charge or just have your Alternator tested. My motor. Black primer 66 coupe, bench seat 5.0, F303 roller cam, TFS heads, Demon 650, MSD
  12. Then, fully charge the battery, leave it for 12 hours and test it. If the battery holds a charge when it's not connected to the car, it's not faulty. TOP TIP: Before you disconnect your battery make sure you know the code for your stereo – otherwise you may find it won't work when you reconnect it!
  13. Don't feel too bad guys. On the Mustang forums I have read tons of posts complaining about the crappy alternators Ford makes and how the OEM batteries don't last very long. It's a general problem all around. I have also read the same problems with Mustangs having ghost power draws that couldn't be found.
  14. After that, the battery may serve as an electrical reserve in case something goes wrong with the alternator's power flow. But overall, the alternator is the king of a car's power source. It is the component that keeps the car running after the battery helps start the engine. How Long Do Alternators Last?
  15. "Battery starts the car. Alternator charges the battery. So, if I have a weak battery, the alternator should recharge it fully if I drive long enough?" Sounds perfectly logical. Too bad it's dead wrong.
  16. Guide To Jumpstarting A Car With A Bad Alternator; How To Troubleshoot Alternator And Charging System Problems; How long do alternators last. Generally speaking, depending on whether you service your vehicle with proper and regular maintenance, you can expect the average life of an alternator to fall anywhere between 40,000 and 100,000 miles.
  17. Oct 08, 2020 · How long does a car battery last without driving? A car battery will typically last about four weeks , but it will vary based on your vehicle and age of the battery. [1] , [2] As mentioned, a car battery dies fast in hotter weather, but its discharge will also be accelerated if your vehicle has more high-end electronics to power.
  18. Jul 29, 2019 · #4 – Bad Alternator. Alternators typically last about 5 to 7 years (roughly 80,000 to 120,000 miles) in a vehicle. As you know, the alternator is responsible for keeping the battery fully charged as you are driving the vehicle. But if you have a bad alternator, then it won’t be able to keep the battery charged.
  19. Dec 27, 2020 · If you know how long will a car run without alternator, it becomes easy to avoid bad situations. Few very prominent symptoms are a clear indication that the car alternator is failing. If you observe any such problem when driving, know that you are driving with a bad alternator. These symptoms include battery failure, car stalling, unusual ...
  20. The alternator charges the passenger battery. If the crossover cable connections are bad, the alternator will think everything is charged by viewing the passenger battery only. The drivers battery will drain till it's dead. If this happens disconnect the crossover cable ground. Charge each battery separately until the charge currents match.
  21. How long you leave a car without starting can depend on the condition of your car's 12-volt battery. Most modern cars with a fairly healthy battery should last at least 2 weeks, without needing to be started up to re-charge the battery. If there’s any doubt about the condition of the battery, start it once a week just to be safe.
  22. “They typically last a long time, but some cars need new ones after 50,000, 60,000 miles.”The alternator, which is located on the engine, provides power to the battery and continuously charges the battery and the car’s electrical systems and computers.“It’s a hardworking part,” says Jeff Gunning, service manager with Addison Auto ...
  23. Take the alternator to an auto parts store for a free check. Take out the VR and see if the carbon "feet" contacts are longer than 1/4 to 5/16" long. If shorter replace. Take the battery to the auto parts store for a free check. If the battery is older than 3-4 years, replace. It puts a lot of strain on the alt.
  24. A properly operating alternator cannot charge a bad battery! A new fully charged battery can't spin over a bad starter! ALTERNATOR TESTING The best method of testing a bad alternator is with a voltmeter. TESTING AN ALTERNATOR WITH A VOLTMETER Put a voltmeter across the battery while the engine is running . Voltage should be 14.2 volts.
  25. In the daytime, you can probably drive for twelve hours or so. The only battery drain is the ignition system and your stoplights. At night, less, because your headlights are a significant drain. I drove a car for years with no alternator.
  26. If the alternator up and dies, then you will still have battery power, but on the modern BMWs need enough electricity to power a small town just to run all the systems, the battery isn't going to last very long. The days of driving the old Chevy pickup 150 miles with a dead alternator are over!
  27. My dad was driving in last 10 years a 88 Pontiac on a road trip and had alternator fail. He kept tabs on power in battery and drove it over 2 hours to my house. I think you probably made it as long as the cooling fan didn't run much. The sign its getting low would be probably the fuel pump pressure goes down reducing power.

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  1. When you drive without a functioning alternator, your vehicle can only go for around Twenty-five miles before the battery is empty if you had a fully charged battery. Twenty-five miles translates to a maximum of approximately 30 minutes of driving.
  2. Thanks for the reply, unfortunately there isn't a marked date on top of the battery, i just bought the car a few months back. I'm thinking either there might be too much corrosion on the inside of the terminals even though i cleaned them pretty well, or my dad suggested the voltage regulator in the alternator.
  3. So your 100mA load can go 250 hours and still leave enough to start the car. But after the car battery is two years old in a rough environment, the battery capacity has dropped to perhaps 30AH so 50 hours is all you can
  4. Car Battery Lifespan. There is no exact answer to the question of how long a standard car battery will last as that depends on a number of environmental factors along with other circumstances, but generally speaking a car battery typically lasts between two and five years.
  5. After that, the battery may serve as an electrical reserve in case something goes wrong with the alternator's power flow. But overall, the alternator is the king of a car's power source. It is the component that keeps the car running after the battery helps start the engine. How Long Do Alternators Last?
  6. Jun 07, 2005 · However, it does not remain there all of the time. It may remain at 14.0 – 14.2 for quite some time, but it will usually drop to the 13.8 –14.0 range. If your alternator is producing abnormally high volts it could be a sign that the battery is not charging fully.
  7. I had a fairly new battery die today (107 degrees f in Tucson). The alternator is putting out [email protected] the post and @battery. Battery voltage is 11.2v and was tested and determined to have a bad cell. (I did test it with the bad battery before I pulled it) Before I replace the battery I wanted to know if that is the right voltage or not.
  8. Would a bad battery cause the check engine light to go on and could it cause misfires? I had purchased a new Battery on 03/17/2016. (Toyota Truestart Battery FP Number 00544-27f60-710, 84 month warranty). 0054427F60710 - TrueStart Battery - Genuine Toyota Part It failed and was replaced under warranty on 04/25/2018.
  9. An alternator charges a vehicle's battery. When an alternator is going bad, the battery drains quickly. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.
  10. The battery, alternator and fuel pump aren’t the only culprits when your car dies off you while driving. We’ve come across many cases that are due to the ignition system, a defective speed system, an overheated engine, a bad MAP sensor (that thingy that reads the air and fuel ratio).. but if this happens to you, have a look at these top three reasons before moving on to the rest.
  11. Feb 13, 2009 · The best way to test to figure out the problem is the battery or the alternator is what you should do as the following: 1. Definitely yes, you can unhook the positive battery terminal to test the battery while the vehicle is running. Why? It will not damage to the alternator or the charging system if you don't drive the vehicle.
  12. Oct 20, 2017 · The alternator can drain a battery over time and shorten its lifespan, and you don’t want to unnecessarily run through batteries on account of a bad alternator. Basically, your battery gets the engine going, but once it’s on, the alternator takes over and can, in theory, continue running the car without the battery’s help.
  13. Oct 28, 2020 · The alternator charges the battery when the engine is running and, once the battery is depleted, the vehicle will die and fail to restart. How long does an alternator last? An alternator is designed to last the life of the vehicle—but that doesn’t always happen.
  14. After that, the battery may serve as an electrical reserve in case something goes wrong with the alternator's power flow. But overall, the alternator is the king of a car's power source. It is the component that keeps the car running after the battery helps start the engine. How Long Do Alternators Last?
  15. Jan 31, 2020 · The truth is, there’s no way to know how long it will last. It might last several months just making a noise and doing nothing worse. Or, it may end up failing the next time you start your car. However, driving with a dying alternator can cause other problems, such as damaging the battery.
  16. Dec 03, 2020 · Your battery will die. If the alternator goes bad, your battery will get drained pretty fast. As a result, you’ll stumble upon a dead battery every week or so. The battery might get dead even overnight. If your condition matches with 2 or 3 symptoms from here, you should take a quick test for confirmation. Testing Alternator by Disconnecting ...
  17. An alternator charges a vehicle's battery. When an alternator is going bad, the battery drains quickly. If the alternator is going or has gone bad, in most cases the vehicle can be driven for a short distance and for a short period of time, allowing you to make it to a service station or automotive parts store for a replacement alternator.
  18. Weak or dead battery. A car battery will not last forever and has a finite life. As good as an alternator is at replenishing your car battery, it can only recharge it to the point that it has a decent amount of life left in it and is able to accept a charge. The alternator cannot bring a very weak or dead battery back to life.
  19. Apr 07, 2016 · On average, how long will a Volkswagen Jetta last? Of course this answer will vary depending on how much driving you do personally, but the average driver will travel 13,476 miles in a year. It will take approximately 7.5 years to reach 100,000 miles, and the typical Volkswagen Jetta has no problem surpassing this milestone as we stated before.
  20. For more on the charging system in your car, see When Good Alternators Go Bad (and Why). How to test car battery for dead cells. Often times a battery won't go bad all at once, but one or several of the cells that make up the battery will go dead. When this happens you tend to first notice it as a slow to crank condition when starting the car.
  21. The average duration a car battery can last is 4 to 5 years or even 3 years in hot climates such as Arizona and Florida. Therefore if your battery is more than 4 years old and car battery voltage drops quickly, it is possible it has reached the peak of its useful service life and requires replacement especially if it does not hold a charge but it has a normal working charging system.

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