When I drive my car without A/C my car run good but A/C on my car gets under power and headlights get little dim/fluctuate. Minimum force needed for an air strike against a wind farm? My line of thinking was that if it's not being charged properly due to voltage drop across the terminals, there's little to be concluded from any voltage measurements. Voltage drop, usually on the ground side, causes inaccurate or bizarre digital multimeter readings and oscilloscope patterns. How important is it to register the new after-market battery in BMW vehicles? ", I too am suspicious of the quality of the supposed battery and alternator check. On starters with a remote-type solenoid (relay), check the voltage drop between: Audew 1500 Amp Car Battery Jump Starter Review. Tell us what numbers you read and we can have a pretty good idea of what's going on. How to generate Reaction Diffusion animation? Overcurrent ensues. Most automotive batteries need to hold a minimum of 9.6 volts with a 300 amp load for 10-15 seconds. Right. Alternators use diodes (in a rectifier) to direct current flow out of @Zaid "Given that the battery and alternator tested fine" - or, the guy at AutoZone measured the voltage straight after switching off the engine, got 12.6V, and said "that's good enough for somebody who only wants a free battery check. This shouldn't happen, of course, but some cheaper battery chargers have lousy output stages. Mahendra Patel. I connect and obd2 and cardoc android software for check battery voltage. site design / logo 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. If voltage drops only between battery connected and engine on, your charging system is shot. The panel output voltage rises to 17 volts or so when it's not connected to a load. It only takes a minute to sign up. Given that the battery and alternator tested fine, I'm inclined to think that you need to replace the battery terminals. Some chargers have a relatively high voltage threshhold. Each battery is complete with 6 separate cells that each contains 2.1 volts, for a total of 12.6 volts. I measured the voltage across battery posts to be 10.6V. A multimeter is designed to put as little load as possible on a circuit. My car is dead in the morning after being parked overnight. 3) Battery charger output stage blows out. Then turn the car on (that is engine running) and measure/record the voltage again. If the starter is eating more power than normal it can drain the battery. Don't try to start the car, just measure the idle current with everything nominally off. Remember that a fully charged battery that has rested unused will read 12.5 volts. One or more cells of the battery is low on water or the plate is collapsing. 05/05/2016 by This prevents a short circuit between the positive terminal and ground. A reading of 12.65-12.77 volts means your battery has a full charge. Why does the B-29 have eight oil needles? Rodney J. Lang, Would that be the same fuse for a 2016 Ford Fiesta? Depending on condition of the starter and how much current it draws the voltage should not drop below 9.6v. If your battery voltage gets to 14 volts or if you hear a bubbling sound when you put your ear to your battery it means you're overcharging your battery. When the Car is Running. Voltage drop on car battery. There are situations where a 'smart' battery charger won't recognize a battery because the battery is deeply discharged. If voltage drops when the battery is connected to the car you have a short. Simulate bitmap mode in photoshop for e-ink photo preparation. My 96 Honda accord keeps killing the battery I put brand new alternator and battery and it will last bout two days and then it will die but alternator is reading good on computer, 04/14/2018 by If not, bring it to them to charge it for you if you don't have a charger handy. A battery can read full voltage, but under load will drop voltage. In another case I also had a battery drain dead with a radio ON within one day. Thanks for contributing an answer to Motor Vehicle Maintenance & Repair Stack Exchange! It means the battery is dead. The terminals are pretty corroded after a little over a year of use. Use just plain ball bearing grease or vaseline after cleaning them with a wire brush (or replacing them altogether). Depending on the load on the electrical system, anything higher than battery voltage is good voltage for a vehicle. Once the vehicle is running, the alternator will kick in and take over the task of powering the car while also recharging the battery. Do this, get a battery charger for your car, charge the battery, and when it's done measure/record the voltage when the battery is disconnected from the car and connected to the car. Also, start with a fully charged battery before hooking up the maintainer as it's not meant to charge a weak battery, only to maintain a healthy one. It could have just checked that the resting voltage of the battery was over 10 volts and the running voltage was over 12. driving battery voltage drops During starting it can go down to 9 volts or less , medium cars starter motor are 250/300 amper rated. We tried to start the car again but couldn't. I have 2006 dodge caravan and my battery will not charge it will run for a little bit n the battery light comes on we got a new alternator n replaced the computer what could it be ?? Buy a decent Schumacher battery maintainer that will actually do a proper job. Bad connection to starter or problem with starter. If the battery is dieing from just SITTING, you likely have a short somewhere. My girlfriend's 09 Camry is not starting unless it gets jumped. Batteries are normally tested with a dummy load. The no load (everything off) battery post voltage should be at least 12.6 volts and as high as 13.8 volts. 07/12/2018 by Remember, a 12 volt battery (adjust numbers for 6 volt, etc.) Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. (26.6 C), while the voltage drops to a cut-off of 10.5 volts) times 20 hours. Must observables be Hermitian only because we want real eigenvalues, or is more to that? Breaks in the battery cable. Perform an Alternator Diode Test. is effectively discharged at 11.9 to 12 volts (fully charged is 12.72 volts). Where is the source of the Seneca quote to good, it is not enough to be better than the worst? Car Battery Load Tests Load Test the Battery. And don't just buy a cheap piece of junk maintainer (trickle charger) from Harbor Freight. Literally jumped it all the time. When current flows the voltage drops due to internal resistance in the panel. There is a voltage table above for battery charge. Connect and share knowledge within a single location that is structured and easy to search. After jump starting it and running it for a few minutes, we turned the car off and measured the voltage across posts to be 12.6V. I hear more problems from people with alarms than anything else when it comes to dead batteries. A fully charged car battery voltage for a vehicle that isnt running should fall between 12.4 volts and 12.6 volts. 12.6v is the optimal battery voltage. pauljohn (Marine/Ocean) (OP) 5 Apr 06 11:48. Can I cut the steerer tube with a pipe cutter? If you check battery voltage after shutdown it will be higher. I have a Car battery charging step-by-step . Tech Tip: Checking Voltage Drops 1) With the voltmeter connected to battery, and key and engine off, record a "base" voltage reading. My girlfriend's 09 Camry is not starting unless it gets jumped. The battery is 14 months old, so not very old. The actual open circuit voltage of a 100% charged battery is between 12.70v and 12.80v because each cell don't drive it far enough to recharge it. I talk about why my voltage keeps dropping on my battery when the car is at an idle! Double-walled rim's what difference depth makes? Does it take a lot of spinning to start the engine? Voltage drop on car battery. This data and the way it relates to the design of your battery should provide you with some useful insight into the functioning capacity of your car battery. Battery died with the van off and the radio on for more than 5 minutes. When a discharged battery is disconnected, the voltage will rise back to near normal. Please see the directions for charging a deeply discharged battery. I have two of them, on on my pickup which is rarely driven, and the other on my Harley. This indicates the alternator is functioning. If you shut it off it should be just about 12 volts. i have a alarm and self starter. Amperes is the measurement for current. No-good cuts for general integer variables. Javier zuiga jr. After buying a new battery (car) after a couple of days went to start and battery was dead flat, after having it charged it was flat after a couple days found the problem was shorted diodes in alternator (was draining 5 amps Replacing new alt. Your local automotive shop is more than able to load test your battery for How old is the battery? Are you taking the voltage directly off the battery itself or the cable clamps? I measured the voltage across battery posts to be 10.6V. Good luck and let us know! I suspect either defective battery or high resistance in connections. Would i have to change alternator if it dies over night but not wile im driving the car? understanding uniformly distributed success probability, Make rainbow-coloured bullets to show points, The battery terminals are corroded enough to cause voltage-drop issues, so both battery and alternator are fine but, the charging system isn't able to provide full voltage to the battery, likewise the starter motor isn't getting the expected voltage from the battery. I decided to put a 60-100 amp relay between alternator and battery switching on when car ignition is turned on, the circuit is broken when ignition is off, thus if the diodes short won't drain battery. Their gradual dimming implies that battery output voltage decreases as the battery is depleted. Feb 1, 2010 That and it can insulate the connections at the battery/starter/ground sides. whould dash board light should go off when the engine run and dashboard close, 12/27/2020 by Any recommendations will be helpful. jorgegaribay323, My car dies after i leave the car battery connected over night and its a brand new battery , unplug the passive motor fuse 1&2 orL&R and should fix battery draining just do this once key is in ign and door shut so auto seat belt stays where u can buckle still, not sure y the little auto seatbelt modules cause this but fixed my issue of battery dying overnight with new alt ___2 fuses under hood "#1passive motor L & #2 passive motor R" leave them unplugged, Were are this two fuses on my 2005 acura are located. What's the political reason that acknowledging genocide is such a 'big deal'? I don't ever have to clean them over the life of the typical battery unless something happens to remove the grease. What causes this? Found out that the car radio is draining the battery even when not "on". Do not replace the alternator and your battery just yet! Asking for help, clarification, or responding to other answers. rev2021.4.23.39140. At 12.4 volts, a car battery is 75% charged while at 12.2 volts its 50% charged. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. semiretired48. With all the rain Seattle gets, why is widespread flooding relatively rare? Drops to voltage off the battery itself would indicate the need to check the battery first. Had the alternator and battery checked yesterday and both still we're good. Can I trust a repo I am unfamiliar with to provide me a secure PHP 8.0 package? (Or an alternator problem for that matter.). When your car is running the cars alternator is charging the battery, this is why you should see a higher voltage. Check for amp draw at the battery terminals with an amp meter. If you test it again in about 30 minutes and it already falls below 12 or 11.5 volts, there is definitely something draining it. Dead battery is there anything else that caused this? The cables are corroded but not loose. Moreover, when you connect a digital multimeter or scope to a system with bad grounds, the test equipment itself can create a good substitute ground, depending on the instruments impedance. The different voltages were read while the battery was not under load. could that be the problem or could it be the radio, or a wire not grounded? Near end of lifespan? A maintainer is a lot cheaper than a battery. Then disconnect the red cable which is connected to the positive terminal. Joseph martin, 2021 iFixit Licensed under Creative Commons Privacy 12v should be just good enough, but the fact you got 10v immediately after is suspicious. Second, less likely option: 1) Battery discharged. Its power drops from 100% to 25%. Consider your car battery charged at 12.4 volts or higher and discharged at remove these (2) fuses under the hood "#1:Passive motor L & #2:Passive motor R " make sure u unplug while battery is connected ign (ii) and driver door shut, so u can keep your top sliding buckle all the way back where u can always use it,****fixed my battery draining over night issue , after new alt new cables new battery it turned out to be these *2 fuses = SOLVED DYING OVERNIGHT ISSUE, Were are this two fuses on my 2005 acura #1:Passive motor L & #2:Passive motor R ", 04/17/2018 by Lastly, check to see if the glovebox light is on, or some odd light in the back of the car or in the trunk or what not. (Your battery 2) If the voltage is greater than 12.6 volts (AGM batteries 12.8 volts), surface charge must be removed. 03/24/2019 by but after i park it for a day or two the battery would be dead, no power. Make sure the battery is good. Thank you in advance, When I had the battery and alternator tested yesterday I was told that battery was still at 95% and alternator was steady at 14.5. Battery Voltage low when car is running. Can the postulates of path-integral QFT be stated concisely? Now shows odd behavior, often sucking power from the battery backwards through diodes. The best answers are voted up and rise to the top, Motor Vehicle Maintenance & Repair Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. Battery drops to 10.5 volts after charging. Battery resting voltage drop after trying to start. If voltage drops when the battery is connected to the car you have a short. Did he also then tell you to purchase and use a battery maintainer to keep your battery from dying in the future? I measured the voltage one more time immediately afterwards and it was back to 10.6V. I just went through this with my van. Why do GMs repeat moves instead of offering a draw? I've had 3 batteries in my car in a year and they all run down and the car won't start, why? I had similar problem with car battery dying when not used for three days. Travon cross. Duplicates in "n hamming weight of n" sequence. How do we know what the atmospheric pressure on Mars is? ilanszekely. Disconnect the connecting cables; Important: The cable which is connected to the negative terminal must be disconnected first. Double check all the fuses are good while you are at it. 13 -14v is the average alternator output. The radio was connected "before the key" i.e direct to the battery. I am reading the voltage directly off the battery. Voltage Guide For 12v Batteries A guide for 12v Car, Commercial, Leisure and Marine batteries : A 12 Volt battery contains 6 x 2 volt cells but 12v is the nominal voltage. Riding mower won't start with new battery. I record my battery voltage with A/C on kindly check and suggest me what I do. That wouldn't allow enough current to flow normally. The negative battery terminal is connected to the car's chassis. Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. 11.75-11.89 volts means your battery is dead. should be 13.8-14.+. With the ten dollar multimeter, you set it to milliamperes, and connect it between the battery and the car. If you want to check this theory, connect your meter while the engine is still running and leave it connected, then switch off and read the voltage every 5 or 10 minutes until it stabilizes. Tell us what numbers you read and we can have a pretty good idea of what's going on. I expect you will see an immediate drop from 14.4 to 12.7 (not to 13.2 as for a good battery) and then a drop to 12.1 - not gradually over the next 12 hours. 2) Cheapo battery charger connected. Especially if it is shorting down. These are the most common problems that you will run into with any voltage drop in a battery. think this is my problem but how to fix it - does it mean car radio wiring error? It seems like the battery is obviously not working but what exactly is causing these voltage changes? The only way to find it. check the terminal connected to the battery post. That hardly rules out a battery problem. The battery was somehow discharged, and your maintenance charger cant properly charge your deeply discharged battery. After jump starting it and running it for a few minutes, we turned the car off and measured the voltage across posts to be 12.6V. 12/25/2017 by Found out it wasn't charged when I bought it (as a lot of places don't pre-charge them now) so I charged it and it worked fine. Lots of corrosion can eat away the copper. Then turn the car on (that is engine running) and measure/record the voltage again. Check with the place you bought it from and ask if all batteries are pre-charged. If the battery dies after some driving and can sit relatively ok, your alternator/charging system is malfunctioning. Q: At what voltage should a car battery be replaced? Accessibility. Or a faulty install of an alarm system Just for sake of safety, make sure the connectors on the posts of the battery aren't corroded. If youre readings are significantly higher or lower than these then it would indicate a fault with the battery and/or the alternator. Are the cables corroded or loose? I'll post a picture when I get home. I replaced the battery, battery didn't work. With car running (alternator charging) voltage is between 13 and 14.2 volts , the voltage regulator stop charging at 14.2-14.3 volts. I have seen a tough ceramic-like substance form here, and it eventually stops all conduction. Furthermore, if you connect an excessive number of 12-V lights in parallel to a car battery, they will be dim even when the battery is fresh and even if the wires to the lights have very low resistance. It has just enough voltage and current to keep all of the computer memory alive; while the cars main battery is disconnected. Can a Tiny Servant made out of a crossbow shoot itself? Alternators typically put out 13.8 volts. Terms So, a memory saver is simply a connector, with a small battery. Remember that this is not a valid reading since the alternator is actively charging it. A good battery should be between 12.4 to 12.6v at rest, it will drop some if any accesories are on (lights, radio, phone or gps chargers, flashers, etc) if you have an automotive voltage/amperage tester available, you can do a load test on the battery (hook it up and load it by 1/2 the cca rating of the battery for 15 seconds) if it drops below 10v, it's time for a new battery. Should I be concerned? This is the part of the connector that connects to the battery terminals. I have a 99 gmc Yukon my battery keeps dying it all start one day i was driving and my battery gauge when down and killed on me while driving got a jump same problem happened changed the battery and the alternator still the same problem after the battery life dies took the alternator to get tested its perfect and brand new battery is brand new and dead as a door knob keeps happening whats my problem? Guy-Charles Cros quoted by Osamu Dazai: "comme un crapaud contourne une pierre". What if my charged up and disconnected (NEW) battery is at 13.1 volts in the evening, then is down to 12.4 the next day (~ 12 hours disconnected from everything but thin air). In theory, at 80 degrees F, a 100 Ah battery should be able to continuously provide 5 amps for 20 hours while maintaining a voltage of at least 10.5 volts. Then the leads are connected to the battery terminals, positive to positive and negative to negative to get the voltage. If the battery isnt fully charged, it will diminish to 12.4V at 75%, 12V when its only operating at 25%, and down to 11.9V when its completely discharged. my honda would start up o.k. Making statements based on opinion; back them up with references or personal experience. jump it again and measure the battery voltage while its running. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If your car battery voltage is discharged, or If you can get a meter right on the battery terminals and they are at a higher voltage than the connector, then there might be a drop as mentioned above. She took the car to Autozone where they tested the battery and alternator and said both were fine. Unusual voltage drops or unwanted resistance are more common on the ground side of a circuit. To learn more, see our tips on writing great answers. 04/05/2016 by Its not a matter of voltage but of capacity and power output. Secondly, if the alarm/starter is aftermarket or was installed by anyone other than a professional alarm installer, you very well might have something draining the battery constantly. my mechanic says i let the battery run down, in the summer!!!!!!!!!!!!!!!!! A picture of the battery + terminals would help narrow down what might be going on here A coating of the anti-oxidation grease commonly used in electrical panels works wonders at keeping your battery terminals happy. This is where current supplied to the starter returns to the battery. Check the state of the battery If the starter cranking voltage goes below 9-10 volts, you have a problem with starter current, engine grounding, or battery. Thirdly, once the battery is charged, the voltmeter (read the instructions how to check voltage with DC volts) should read between 12 and 13 volts across the battery posts while it is running. When a car drops, for instance, from 12.6 to 12.0, there will be 75% difference. If voltage drops only between battery connected and engine on, your charging system is shot. Try measuring the voltage at the alternator and see what it's producing. well i tested the battery and it was @ 12.6v (not connected, not trying to start) well i asked my wife if she could try turning over the car while i tested it, well then my voltage drops 12.45-12.54 volts means you have a 75% charge, 12.24-12.29 is 50% charged, and 11.99-12.06 volts is 25% charged. Car Battery Disconnect Memory Kit. I'll inspect the cables next. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Shouldn't it be "regno" (dative) rather than "regni" (genitive)? Sometimes all it takes is one little light to drain a battery. She took the car to Autozone where they tested the battery and alternator and said both were fine. In Vulgate, Matthaeus 4:23, it says "et prdicans Evangelium regni". If measured at this point, the battery reading you will get will be anywhere between 13.5 to 14.7 volts. If impedance is low enough, this can be frustratingif your equipment is connected, If the voltage holds when not installed in your vehicle, but drops when it is in your vehicle, see 1 above. 3. Disconnect your panel. Current is a different story.
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