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How long will a battery last with a bad alternator

Mar 14, 2016 · Disconnect the wiring harness and the battery cable from the back. Now start loosening the two 13mm bolts on the back of the alternator and the 15mm bolt on the front. Be prepared to catch it when you remove the last bolt, because the exciter wire is still attached and could break if the alternator falls. Quickly disconnect the exciter wire. Jan 07, 2011 · A good alternator will put out 14+ volts, if it's putting out 12-14 volts it's wearing out and needs replaced. If your alternator is putting out 10-10.5 volts or less means one of the diode pairs are bad, 5-5.25 volts or less 2 diode pairs are bad. Either way the alternator is not charging the battery and it's the fault of the voltage regulator. A car’s battery uses an alternator to recharge; the alternator is a motor that works when the engine is running, recharging the car’s battery as it goes. It works similarly to a generator, using fuel to generate energy, and making sure that the car battery has enough power to run all the electrical components in your car. The charge of a conventional 12-volt automotive battery is actually 12.6 volts. This can vary slightly, depending on the concentration of the electrolyte in solution.

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. Feb 28, 2017 · If the battery is weak or dead, the alternator cannot bring it back to life. A good way to rule out a dead battery is to charge the battery to full capacity and start the vehicle. If the battery is weak, the car will continue to run but the lights will again become dim shortly after, indicating a problem with the charging system within the battery. The alternator, as mentioned above, works to charge your battery. If the alternator fails, the battery will fail shortly after. The best way to detect a bad alternator is to start the car, then remove the negative battery terminal with the engine on. If the car stalls, then your alternator isn't working, and your battery is taking its place. The next group of ripple tests occurred on an alternator test machine equipped with a conventional car battery. The subject was a 60A Nippondenso from a Civic, running at the equivalent of fast idle. The scope is the same one I used on the Accord— also connected to the battery.

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Sep 20, 2010 · My car died while driving home last night, and the problem seems to be the alternator. I had to towed back to my apartment, and now I need to get it into a shop, but I'd really rather avoid paying for another tow (adjunct prof, and I don't get my first paycheck of the semester until February 12).
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.
Depends what accessories you have on during your last drive. 15-30 minutes no accessories. The only purpose of a battery is to start the car, after you could take the battery out and toss it in a garbage can, so long as you don't turn it off, or run out of gas will run forever.
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 ...
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
Jun 05, 2012 · A battery under no load sitting at 10.5 would be considered a bad battery for a 12v battery. However under load you have to interpret you load tester’s result, and most are designed to put a high load on the battery, and in most cases will drop a battery into the 10 volt range.
Updated August 3 · Author has 866 answers and 176.9K answer views A fully charged 2008 kia sedona brand new battery with a bad alternator lasts around 20 to 25 min. How do i know this you might ask? Becuase of the car broke down in one town and we needed it home.
I don't suspect the alternator: When the car is running, 5-6 amps flows into the battery and the voltage on the battery is 13.6 V; and if I drive the car once or twice a week, the battery never dies. I do suspect something with the keyless remote.
Would a newer battery give me a higher Voltage reading while the car is running than what I already have. I.e. instead of getting a reading of 13.8 V with a aging battery and good alternator will I get over 14 V with a new battery and good alternator (while the car is running of course)
With no battery in the circuit to act as a buffer, the alternator can put out up to 150 volts, depending on engine rpm. When the smoke clears, that “simple test” could end up costing you several thousand dollars for new electronics.
The alternator isn’t charging the battery because of other problems on the vehicle like bad wiring connections, bad battery cables, a bad battery or a bad PCM. So save yourself the embarrassment and hassle of a comeback and test the alternator wiring connectors and wiring harness.
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.
Oct 27, 2020 · 5. Bad Alternator Diode Test. Usually, a bad alternator diode will cause your headlights, instrument panel lights, or stereo display to flicker or dim and, sometimes, drain battery power overnight or much sooner.
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.
So a last week my battery light popped on. After 5 minutes of driving it will go on and won't turn off. I had my alternator and battery tested 3 times and they tested good every time.
Apr 14, 2020 · 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.
Check the battery and battery cables to see whether everything’s in working order. A weak or dead battery, or even faulty battery cables, could be causing the problems with your car, not the starter. 2. Tap the starter. Try lightly tapping the starter a few times with a hard object, making sure not to pound it.
Aug 09, 2018 · The alternator is one of the most important components in your Audi. It is intricately related to the battery and also provides electric power to the car. If it malfunctions, then it will affect the integrity of your vehicle. Here are the signs that indicate the failure of the alternator in your Audi.
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.
This is problematic, since the car battery is only designed to kickstart your starter motor, rather than supplying long term power, and will drain your battery quickly. However, a flat battery isn’t indicative of a failing alternator. Age or a greedy electronic device (eg. a headset) may also cause a battery to die.

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• A state of discharge that runs for so long, leaving the battery to temperature conditions that will make matters worse. • The battery reaches a massive buildup (usually due to “discharge” again) of leaks, spillage, grease, grime or overall corrosion, leading to battery decay. This system has an external regulator. I got troubleshooting info and started going through it. I found some of the wiring was corroded pretty bad, one was broken at the regulator. I bought a single wire alternator from Amazon, a Denzi model. It actually lined up very well, the original wire to the battery was good, and it has been great.

Your car battery is charged by your alternator. Often, when a battery fails, it's due to a fault with the alternator. Generally, if you can keep your engine RPM up, your alternator will charge your battery at a faster rate. If you are driving on a motorway, you should be able to charge your car battery in 30 minutes. Jan 07, 2011 · A good alternator will put out 14+ volts, if it's putting out 12-14 volts it's wearing out and needs replaced. If your alternator is putting out 10-10.5 volts or less means one of the diode pairs are bad, 5-5.25 volts or less 2 diode pairs are bad. Either way the alternator is not charging the battery and it's the fault of the voltage regulator. Mar 15, 2015 · from my understanding the battery determines how much amps it will get. Even if you have a 95 amp alternator capable of putting out 95 amps, the battery will only take what it needs. if its completely empty it might take it all, but as it fills up it takes less. Amps are always available but its the voltage that forces it into the battery. Oct 13, 2019 · I am on alternator number 8. This last one lasted 4 miles. Im getting their duralast gold ones. Cost me $375. Well this last one started overcharging. An old timer told me this trick test to see which is bad, the battery vs alternator: With the car running, pull the positive battery lead. If the alternator is running correctly and strong it will generate enough juice to keep the engine running (and therefore the battery is the problem). If the car dies then the alternator is the problem. 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?Jan 15, 2016 · How Long Does a Starter Last? YourMechanic. ... (this could also be a battery problem) ... the bad and the surprising. 1. The Aston Martin DBS Superleggera leads this month's list of discounts. 12. I tested the old alternator and it was bad. So of course I bought a new alternator assuming that would fix the problem. Drove it to work and back and lights went dim, rpm gauge went out. after a total of 30 mins of driving.

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. Replace the small battery after being test bad, replace BCM, replace passenger footwall junction fuse or pre-fuse block, replace alternator three times, replace left front SAM and left rear SAM still same problem at this point I am out of option it look like I’m rebuilding this car, I check all the ground and positive cable, at idle it give ... Your alternator should last you between 100,000 and 120,000 miles. If it lasts any longer, you are likely on borrowed time and should replace it, just to be safe. How long will it take to replace a BMW N52 alternator? This job should take two hours, on the high side. it is best to start with a good battery when testing an alternator, using a bad/weak/shorted battery will give a faulty reading. I have also found any battery over 4 years old, once dead and has been jump started is not long for this world. batteries that have been drained and jumped a number of times won't be any good for very long. 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...

Aug 18, 2016 · I’ll let you know next month if the battery continues to be drained while it sits for a week or two. My friend said that the bad feedback diode would have been the cause of the battery drain. Well the alternator is the original on the Yukon from 2005 and the engine has 1605 hours on it so that means so does the alternator. It had a good life. Dec 29, 2020 · You can also test your battery too. this is with the car off. you should have between 12-12.5v anything below that is a battery that needs recharge, or replacement. In an event you change the alternator, buy a new battery too. If the battery is bad too, and you change just the alternator, It will eventually make the alternator go bad too. As a rule you should replace your battery when you change your alternator. Especially at $600. I have seen DMEs go bad due to the car sitting for long periods of time and then the owner fires it up and the alternator full fields trying to get the battery V up. I have also seem them short out with battery chargers/boosters. How long does a car battery last? Knowing how long does it take to charge a car battery is important as this will guide you when to charge the battery and also know how. Therefore a car battery has a capacity of 48 amperes that is, it can produce one ampere for 48 hours.

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Aug 24, 2020 · Once the alternator stops working, the car battery is cut off from the power supply. It will run on its own for a while until it runs out of charge. How long will a car run without alternator? It entirely depends on the capacity of the car battery. If the battery does not have a full charge, the vehicle may run from 5 to 30 minutes.
Jul 11, 2017 · Windows doesn’t normally keep you up-to-date with your battery’s capacity level. As you use it and it weakens, you’ll just notice that your laptop doesn’t seem to last as long on battery. Eventually, when your battery reaches a low enough capacity level, Windows will warn you.
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.
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.

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Sep 18, 2019 · Bad Alternator Diode As mentioned, the alternator is a critical piece of car technology that performs two basic things. It powers up the car’s electronics during vehicle operation and it also recharges the battery.
Depends what accessories you have on during your last drive. 15-30 minutes no accessories. The only purpose of a battery is to start the car, after you could take the battery out and toss it in a garbage can, so long as you don't turn it off, or run out of gas will run forever.
Forget about the energy/power/voltage calculation and just make the ampere-seconds for charging equal to the ampere-seconds for discharging, and then multiply by a fudge factor to account for the inefficiencies. 500A × 3s =1500 A-s = 2A × 750s = 10A × 150s. 750s = 12.5 minutes.
How long should a motorcycle battery last? Most of your standard battery manufacturers would advise that, on average, your motorcycle battery should last you in the region of 48 months. My research for this article indicates that in most cases, the battery lasts about 36 months.
A 'surface charge' is all you have on brand-new batteries, otherwise, and as demonstrated, it won't last long! Charge the battery for 2 - 4 hours at 15 - 20 Amps, and you will be able to drive 150 - 200 miles without A/C ...
Depends what accessories you have on during your last drive. 15-30 minutes no accessories. The only purpose of a battery is to start the car, after you could take the battery out and toss it in a garbage can, so long as you don't turn it off, or run out of gas will run forever.
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.
With a bad battery your alternator is working harder to put out the current the battery wants which pulls on the hp of the motor. Yes that leaves less for the rest of the car and coil pack to use. 1977 Chevrolet Impala Sedan
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.
your alternator itself shouldn't be the problem, as said its the regulator you need to look into. and as stated before it should be between 13.6-14.2 ish power output from the alternator when running but its really how many amps the regulator is allowing to be put into the bat that you need to figure out cause it should be adjusting the amps as needed cause putting too many amps for too long ...
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.
This is problematic, since the car battery is only designed to kickstart your starter motor, rather than supplying long term power, and will drain your battery quickly. However, a flat battery isn’t indicative of a failing alternator. Age or a greedy electronic device (eg. a headset) may also cause a battery to die.
Aug 24, 2018 · Since the battery is healthy, it’ll receive power from the other battery, and then charge up properly. Begin by parking and turning off the car with the charged battery next to the dead one.
Nov 17, 2020 · Read the voltmeter. If the battery reads above 12.2 volts, it has enough juice to start the alternator, which can then be tested with the voltmeter. If the battery doesn't have enough voltage, either get the battery charged and re-test or try a different method for checking the alternator.
When I start my 04' 6.0 F-250 it starts fine, runs for 15 seconds and then the battery indicator light in the dash comes on. It stay on for 15 seconds then goes out and stays out until the next morning and does the same routing all over again. Do I have a battery going our or an alternator or...
Apr 12, 2008 · how old it the battery? 5 years or so, I'd replace it too. Next, you never want to charge a dead battery from the alternator. re-read the question. Are you driving around with a bad alternator?...

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Churchill dimoFeb 14, 2011 · Ok so here's the story: My battery has been dying a bunch these past few weeks, so i tested the alternator and it wasn't giving a charge, I assumed the alternator was bad and put a brand new one on. Now i hooked up the voltage tester to the battery with the new alternator and the car still seems to be running off just the battery (at about 12 ... 2. Your battery may simply be very old, and beyond the point at which it can be repaired—in which case, of course, it will need to be replaced. 3. Finally, note that there could be another mechanical problem somewhere in the vehicle, such as blown fuses or a bad alternator. A Meineke service technician can help diagnose and fix any of these ...

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Another possibility is a bad Battery Temperature Sensor. If this sensor tells the PCM that the battery is too hot, the PCM might refuse to power the field coil 'cause it thinks bad things might happen if the alternator tries to charge an overheated battery.