Don't (EVER) Jump Start Your BMW Like This

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Don't (EVER) Jump Start Your BMW Like This
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#BMWJUMPSTART #DONTEVER #BMWMISTAKES

Пікірлер: 285

@christ2414 2 жыл бұрын

I’m new to BMW ownership - about a month. That being said my owners manual says I can jump start the car using the starting aid terminals under the hood. They even call them “starting aid terminals”. It says to switch off all electronics in both cars and connect cables with both cars off in the proper order, then follow next steps, etc. It does say to strictly adhere to the procedure or risk damage to vehicles or persons. Maybe people aren’t adhering to the procedure and damaging their cars, but if I need a jump and don’t have the portable jump starter, I don’t see why to not jump start the car using the written procedure in the manual. I do think that the portable jump starter is probably a good idea though. Interestingly enough, it doesn’t say anything about using a portable jump starter in the manual. Loving the car so far.

@vilon9628 3 жыл бұрын

Hello there , same thing happend to me , modules dead , no electricity found afterwards and i had to go to bmw because i had no idea what was the problem , paid 800€ to fix it , you doc are a beast , listen to the doc everyone !

@n1msu 2 жыл бұрын

My previous car, an audi had the same setup. I never had to jump start it thank god because despite all the tinkering I did changing air filters etc, I didn't see there were terminals under the bonnet! Only found out by googling it now. I had this car 4 years. I'm just glad I never left the lights on overnight! Great advice, it should be included in the quick reference manual too. The F20 I took ownership of a couple of weeks ago also has this layout. Thanks for the advice!

@annechambers679 Жыл бұрын

I am a female who prides herself on researching, learning, and quite a few minor repairs. Just realizing now I'm not as smart as I thought I was. I am on my 5th BMW and I can honestly say probably my last. I have a 2008 535i , beautiful car, rides great but it's just one thing after another, I can afford to buy one but not always afford to get it fixed. Thank you so so much for the battery information, never have I thought to look up how to charge the battery cuz I just figured you charge it like any other car and boy was I wrong. Once again very very helpful I guess I'll have to go out and buy one of the chargers and try to get my car started I'll let you know how it goes once again thank you so much. Signing off, Annemarie from Florida

@aygopayso5330 Жыл бұрын

Mercedes 😅

@brandi6087 Жыл бұрын

I have a 2010 535i and love the car. Unfortunately it's my first and I got it 6 months ago. It stalled out on me again today. This time it left me stranded in a busy highway. I was terrified. So it's been towed and at the mechanics twice in 6 months. It's so expensive for repair work. It's hard to attempt any preventative maintenance.

@virenpatel9973 9 ай бұрын

I had an 08 535i in Florida as well. Amazing car but the n54 is notorious for being unreliable. Don’t give up on bmw. The newer models are way more reliable. I drive a 18 540xi now with the b58. Even tuned the car feels like it’s holding back. Super reliable engines.

@biggur5 2 жыл бұрын

I got one of these jump starters. Bought it a few months ago. Had to use it for my f10 3.0 diesel last week. Worked like a charm . (The only prob is the leads are quiet short and just about reached the earth point)

@stephenbarton2625 2 жыл бұрын

Thank you so much for this video! You probably just save me a massive repair bill

@easysolutionsglosuk1000 3 жыл бұрын

Well they can be sensitive jump starting. Rule is, only jump a slightly soft battery maybe but never jump a flat battery, allow some time for some charge to build up in the BMW battery first ;). I think the main problems can occur when jumping a very dead/flat battery, when the BMWs battery voltage suddenly sags whilst cranking the engine over and the other jump cars alternator and the BMWs alternator can spike above 15v widely trying to compensate the load, coupled with the cars voltage regulation strategy, which can cause over voltage spikes to damage modules. Superior engineering or guaranteed dealer network income?

@IH6848 3 жыл бұрын

A lot of modern cars with start stop systems and intelligent charge systems have alternators capable of putting out a lot more voltage and amperage than an older conventional system where the alternator regulator will maintain around 14 volts max these systems can output a lot more voltage dependant on demand. So if you have to use another vehicles battery on the terminals and you don't have a jump pack, do not start the engine. Not only BMW but some Vauxhalls as well can be seriously damaged by jumping direct to battery, some have the jump terminals despite the battery being in the engine compartment under a cover.

@toddlls2986 3 жыл бұрын

Thanks mate for the info. I did know this but it’s very much appreciated that you took the time to show us all why it’s important mate 🙏

@andyferguson2126 3 жыл бұрын

I did not know this, I know not to jump start it from the battery but a few time in the 1st lockdown my BMW X5 e53, got a flat battery not being in use and I jump started it with leads twice using the wife’s ford, unlucky had no issues or problems 🙏👍

@randomxaos Жыл бұрын

Thank you!!!! Finally... Someone who addressed the specific important data points of this procedure. thank you😎⚡🔥 Too many other videos spend too much time talking about unimportant details.

@ImTMPZv 3 жыл бұрын

Very very well informed video. Clearly presented and too the point. Spot on fella.

@JEtt4108 2 жыл бұрын

This is invaluable information! I knew never not to jump start a BMW but wasn’t sure how. I’ll get getting one if these chargers. Thank you!!!

@truknz71 Жыл бұрын

Ebonics ?

@evieemaya88 3 жыл бұрын

Great video. If you have a battery tester do carry out the tester at the same points in under the bonnet.

@FraxinusExelsior 3 жыл бұрын

This clip might save alot of cars, and alot of owners wallets. Great basic stuff that is easily overlooked.

@ssaafur 2 жыл бұрын

Thanks for the insight. I’ve got an N55. I can’t imagine it’s much different. I’ll cross reference the OM to be sure.

@zoehaze 2 жыл бұрын

Good info my guy. I was E39er back in the day did most of the work myself of coarse and looking to get an F85 soon. What "jumppack" do you recommend or would the one in one in the vid work as well. Keep up the good work!!!

@SuperDuperBDUB 3 жыл бұрын

Dude, if jump starting the car using the terminals blows shit up. . . these cars are crazy.

@truknz71 Жыл бұрын

Jumping from under the hood with jumper cables is fine, it even explains it in the manual how to. I would suggest to connect all 4 cables with both cars off and then just try and start to dead one. If still not enough, then start the good car and then try the bad one again.

@dejavoue88 3 жыл бұрын

So german engineering isn't capable of protecting an ecu bms. Etc etc but they can build cars with massive built in issues that cause engine damage. Oh I see

@c_wonder 2 жыл бұрын

or fit in a damn spare tire for US models.

@grahamepigney8565 2 жыл бұрын

German engineering does protect the ECUs, that is why the connections for jump starting are in the engine bay and they put the instructions in the Owner's Manual.

@hedgehog0209 3 жыл бұрын

Brilliant. I have a BMW 118d M-Sport and I didn't use it for 3 months. When I tried starting it I had a flat battery. Inadvertently, I attached my battery charger directly to the battery terminals in the boot. All I got when trying to start the car was a load of clicking noises and error messages on the dash. So I found your video then went to Halfords and bought one of these Lithium Jump Starters and followed your instructions. Car started first time! Luckily I didn't fry the car all the faults cleared and the car is running sweet. Thank you!

@jailos10 2 жыл бұрын

Hello, I am having a similar issue with my 118d. Won’t start and warning lights on the dash. Tried replacing the battery and still won’t start

@steezrios 2 жыл бұрын

@@jailos10 battery registration ?

@tiith 3 жыл бұрын

Would the same principle apply to the BMW 520d F10?

@arleitiss 2 жыл бұрын

Never had to jump start my BMW but had to jump start other cars. Always used this front terminals, is it better to jump start other cars from front as well?

@aniknatsa 3 жыл бұрын

Hi. Thank you. What charger should I use for 2004 BMW 545i?

@lukecarter1978 Жыл бұрын

Thanks for this video, I have a 320d e90 and will get one of these starter packs. Can I get one of the ones in halfords? I also have a battery charger which has a repair function. Can I use it on my car and if so would it be on these terminals under the bonnet that I connect to. Just thinking ahead for the cold winter were due.

@joshuaromero2732 Жыл бұрын

i have owned bmws since 1995, series 7, 3, 5, and x5 resently i drive a 2017 x5 is very nice, back in the days i used to work on them a lot but now since technology is so advanced all i do is oil change and breaks, right now my x5 battery i believe started acting out but i am not sure that is the issue, today i was very close to jump start it with my portable jumpper, but some how i did not and waited and when i tried, started right up but i very lazy and the gauge needles went up and down and then dropped and then went up staying on normal iddle possition, tomorrow i wil drive to bmw dealer i hope they dont rip me off, for all that saying i just want to thank you so much for such valuble tutorial because after so many years owned these cars did not know that would coause so much damages to modules, thank you for such a good info and taking your time to go down in details, you safe my wallet from drowning and save my money, i was very close to make the problem bigger, god bless you--

@mariogarbey8933 3 жыл бұрын

I having serious battery drain on my 08 e60 , I remplace the battery been 5+ year old for a new one ,is been registered and still getting high battery drain messages , I noticed the ccc running after the car was lock for over a hour but not sure if thats normal ,can you give me a advise how to track the issues

@hkrym5683 3 жыл бұрын

Hi, I have coded my abg following your video ...seat occupancy codes gone but still have a belt tensioner code 0093AA even tensioners is coded out ...shall i just take wires out from main cable under seat and clear fault codes . Your videos are helpful. If you have contact info for your garage please do mention . TIA Best of luck brother 👍

@Steve-cs3tt 2 жыл бұрын

Also what is the best way to charge the battery in a 2000 BMW 328ci ? Thanks, Steve

@lorenzocosta9992 3 жыл бұрын

Question i have a f10 when i crank the car do I have to crank it with the battery charger connected or I have to charge then disconnect it and crank it?

@First-class-angling 2 жыл бұрын

Hi sir, Just wondering if i use 1000A 12v on my bmw m4, is that ok ?

@nelsoncordova9354 2 жыл бұрын

On my e46 it seems everytime i work on my car & keep the doors open for periods of time my battery dies. I have jumped my car from a charger before & could tell my modules didnt like it & was fortunate not to have any blown or defective cause of doing a boost. So I usually remove both top post terminal connections & charge my battery this way till Im @ 12v to under 13v. I do have a question though if u would BMW doctor, i read somewhere on my Owner's manual that the car is supposed to sense how much power is left in my battery & if it senses that the battery is about to die , its supposed to make sure & leave the battery w/ enough juice to crank the car one last time before it dies. Any idea why this isnt happening or is this a false statement from BMW? Thanks. Nelson

@vikingsystem 3 жыл бұрын

hi BMW Doctor, I need some help from you. I have a E65 730d M57 engine with 218cv, all stock from 1 or 2 months ago I fell a slightly shacking from the engine when idle and with the engine cold. no misfires, no lack of power, nothing, only a small shacking and only with the engine cold. times to times I have a smooth running controller fault, and I suppose is all related with some faulty injector, so I did a test with INPA and ISTA. got this results: INPA selective mass adjustment (mg/hub): cylinder 1: 0.16, cylinder 2: 0.70, cylinder 3: -2.09, cylinder 4: -0.28, cylinder 5: -0.40, cylinder 6: 1.93 ISTA D correction injection quantities from smooth running regulator in (mg/stroke): cylinder 1: 0.3, cylinder 2: 1.1, cylinder 3: -2.5, cylinder 4: -0.1, cylinder 5: -1.0, cylinder 6: 2.2 ISTA D minimum/maximum correction fuel injection rates from the operational smoothness regulator in (mg/hub): cylinder 1: 0,0 | 0.6, cylinder 2: 0.0 | 1.2, cylinder 3: -3.1 | 0.0, cylinder 4: -0.6 | 0.2, cylinder 5: -1.0 | 0.0, cylinder 6: 0.0 | 2.2 I guess the problem is the injector 6, but I´m not sure if this is the case or any other injector or more than one, also some people say when replacing one injector we need to replace all injectors, I don't see the point replacing all if there's only one or two faulty. can you help me sir? any hints will be much appreciated, please. my best regards and thank you so much

@alinduta5398 3 жыл бұрын

i have suaoki u28 i started three diesel cars with no problem this jumper is not on ebay for the moment because is very good sold out

@RHF52 2 жыл бұрын

For my 2015 BMW X3 xDrive F25 2.0 Diesel, I bought NOCO's Boost Plus GB40, along with it's Carrying Case. I also bought, for my Daughter's FIAT 500C another NOCO Boost Plus GB20 and Carrying Case.

@paulw914 3 жыл бұрын

What should i use for a trickle charger. My 2001 740il is not a daily driver.

@shazadkhan5580 3 жыл бұрын

Will this charger work for a e93 335i 2007 aswell

@sasomitch74 3 жыл бұрын

Replaced the Battery and now I get a low buzzing noise when I turn off the E60 that now won't go away. Error code Supply Terminal 30E don't know if I messed up the IBS by jumping the car the wrong way before I replaced the battery. Any advice thanks

@TakeKeyz 3 жыл бұрын

Damnet so only the Gods been with me🙌🏾🙌🏾 no more never again ziltz nada..thank you

@shahulanas5618 2 жыл бұрын

Bro I have a doubt. do I need to register again after removing and refitting the same battery, after charging ( bmw 320d)2012

@mosam5097 3 жыл бұрын

Hello Dr please advice me which best reasonable price battery for my E90 320i 2007, please sent me a link

@robi4387 3 жыл бұрын

BMW and other manufacturers put batteries in the boot/trunk for several reasons. 1 Weight distribution 2 Cooler away from the engine (and batteries don't like excess heat or cold) 3 Packaging - on the bigger engines there just isn't space under the bonnet Does no one read a car manual these days. The manuals tell owners to charge from the terminals under the bonnet/hood Explanation - so that the PCM and IBS know what is going on and to avoid voltage spikes. Perhaps people need telling I guess. Better to spend £50 -£150 on a Suaoki or NOCO than risk frying something. PS Dean you need to replace the O ring seal on your CHF reservoir.

@BMWDoctor 3 жыл бұрын

I know mate gotta do it lol haven't got round to it yet and the new car is coming bro got to many cars and no time bro lol

@windward2818 2 жыл бұрын

Do you charge your BMW from the terminals under the hood? If so, what charger do you use. Thanks.

@clearvision2196 3 жыл бұрын

Thanks so much for your videos there are vary helpful 👍

@scotwilson4169 2 жыл бұрын

95% sure I will have to jump start my e90 325d when I get back, it will have been just over 7 months by then 😅 Luckily for my job I have a battery pack jump starter like this, slightly bigger and was banking on just using that.

@maniv2119 3 жыл бұрын

Would this work for an X6? Thank you.

@kianward5999 3 жыл бұрын

great content az always dean what a great channel fairplay te ye bro

@Steve-cs3tt 2 жыл бұрын

Can this procedure be used on a 2000 BMW 328ci ? Thanks, Steve

@Skykitten246 3 жыл бұрын

I live in the uk I have the halford one up to 2 litre engine would that be oaky to use?

@ryanhosein7640 9 ай бұрын

Does this apply to the BMW X6 E71 also? Didn't hear you mentioned this model.

@theodoreesawjr.8352 2 жыл бұрын

Thanks for that vital information Doc!!!!!

@enedifanovaha7713 3 жыл бұрын

What is that box to use jumb start your bmw can you use on e90

@alss9823 2 жыл бұрын

Hey, what about the common E90/91? I'm guessing the same rules apply.. actually I'm thinking that for all. the Es and Fs..

@dah7143 Жыл бұрын

Knowledge is a wonderful thing. Thank you for sharing.

@kameelramdhin7403 3 жыл бұрын

Very informative video, when purchasing a jump starter what's a good power rated unit to buy

@andymannion7548 2 жыл бұрын

Top tip mate always informative 👍

@georgemonappallil6241 3 жыл бұрын

Can I use this for E87?

@drivelogic3841 3 жыл бұрын

Thank you~ well explained ~!!

@BMWDoctor 3 жыл бұрын

You're welcome!

@annaifos 3 жыл бұрын

Does this apply to e90 as well? And is this the Suaoki safe if the battery is completely drained? Thanks for the vid!

@egotbands2145 2 жыл бұрын

Bro I accidentally jump started my e90 from the battery don’t know if I messed it up car was running but didn’t turn on afterwards

@iTrinityPlays 2 жыл бұрын

@@egotbands2145 Best thing to check first, is the BST Postive Cable, and/or the Battery Distribution Box, that's the red plastic box, that sits on the battery. The fuse inside fries. And blows out.

@cherylhorn3227 2 жыл бұрын

I have a 2006 BMW Coupe Convertable, and after quick starting my engine and driving it, after shutting it off, it will not start on its own. Can you tell me the problem please?

@markhurlin715 Жыл бұрын

Another great video as always I’ve learnt so much watching your Chanel would you recommend this for a f11 2.0 diesel cheers

@franticstorm7411 3 жыл бұрын

Always connect positive first.

@loveeveryonepeace9081 3 жыл бұрын

Thanx for this video really helped

@dickdastardly5534 2 жыл бұрын

I know this might sound like a stupid question but I have a 520D tourer I think its a G35 but where can I find out ? Many thanks

@bmw.source 3 жыл бұрын

Will this work on the E90 as well? I have the same + & - terminals on my N52B30

@guy4469 3 жыл бұрын

is this the same to charge my battery .I want to put my battery on charge for 12 hours without taking the battery out of the car .

@edwardduarte5123 3 жыл бұрын

Damn. I didn’t know. Thank you

@elainenicholas-best9933 3 жыл бұрын

Thanks. Great information.

@robinwells8879 2 жыл бұрын

That currently makes literally no sense to me from an electrical engineering point of view. I can’t see how the car will see any difference between one battery or two in parallel even if one is discharged. Possibly the 14.5V of a running car might over voltage the starting systems that would normally only see very low volts whilst the starter is cranking. Very odd. I always understood that the battery was in the rear merely to assist with weight distribution. I must go and look at the circuit diagrams. Definitely agree about the jumper packs with the smart connection monitor though. Getting the polarity wrong when jumping is definitely catastrophic and often ends in a battery explosion raining acid everywhere.

@marleyjanim5033 2 жыл бұрын

Could we get an upsdate

@kevingervais7678 Жыл бұрын

As a EE too, I agree. But let the BMW owners think what they will. I charge my Z3 from the trunk (boot), but I jump start it from the hood (bonnet) all for convenience's sake.

@chrisbradley3224 Жыл бұрын

I agree that it's probably fine to jump from the front. Honestly, any automotive system that can't handle at least 16V and transients is incredibly poorly engineered.

@apodski Жыл бұрын

Old BMW's don't seem to care. Most bmw's also have batteries that last like 10 years too, because they are big and trunk mounted. The e60 shown here has notoriously dodgy electrical systems. They also were the first bmw's with lead free solder and computers in the trunk that tend to get wet. Don't get an e60, so many electrical gremlins.

@keithhunter8158 4 ай бұрын

If the batt is totally flat and you jump start. when jump leads are taken off you will get a high spike voltage causing damage to the system

@pavlospilakoutas 3 жыл бұрын

Using the points in the engine bay for maintentaing the batteries when the car is not used, could cause any issues?

@grahamepigney8565 2 жыл бұрын

You are weakening the charging because of the cable run to the battery. Always charge the battery not the car.

@mosam5097 3 жыл бұрын

Advice which jumpstart for 320i 2007 please

@kevint3845 3 жыл бұрын

Yep good information as usual, cheers 🍻

@jawad5867 Жыл бұрын

Can you trickle charge from the battery direct whilst it’s in the car?

@zooedca 5 ай бұрын

Question if a towing company did try from trunk when i wasnt there, what will it do? which fuses will it pop?

@TheCajunAsian 2 жыл бұрын

Just like any battery pack, doesn't it lose charge after being in your car for weeks? Do you make sure you charge it up like once a month or.... Would suck to rely on that and one day 6 months later the thing doesn't have enough juice left, esp in FL the car interior regularly gets over 130F

@mymai5859 Жыл бұрын

What I've seen is the battery packs hold their charge very well long term. As a precaution once every 3 months check it on a mains power charge to make sure it's always topped up.

@CombatDoc136 2 жыл бұрын

Wow youtube finally recommended something useful.

@Bond-uh6yj 2 жыл бұрын

Omg! Thankyou Thankyou Thankyou! So relieved i watched this 1st..

@pjcook480 5 ай бұрын

Hi Dean I’ve jumped started my BMW from the battery now the driver and passenger windows don’t work Their in the anti lock You after keep pressing the button to get them up and down I’ve been told I have to put the car on diagnostics and turn them on In your opinion does this make sense Thanks Peter

@isakisak9989 Ай бұрын

I've tried to jumpstart my e87 118D the correct way from the hood in winter but it just never works for me, it does not deliver enough power to the battery to start the car, but when i jumpstart from the battery itself from the trunk it starts instantly, might be the incorrect way but it acctually works for my car.

@LILLENSMEK 2 жыл бұрын

Hi there. I have a friends car here a 520 diesel and i only get 3 volts at the front. But at the battery i have full power. So i jumpstarted it and it starts. But not charing.

@keithh3099 2 жыл бұрын

So that’s a cool video, but if the jumper I have doesn’t work maybe because it’s a poor jumper or bad battery how to you replace battery if you can get the trunk open. )2016 bmwz4 e89)?

@chrisj5097 3 жыл бұрын

What if you only have jump cables available need to jump in car right now? Now?

@grahamepigney8565 2 жыл бұрын

BMWs have had the battery in the boot or under the back seat since the '80s with corresponding terminals in the engine bay to start the car from a booster pack or another car. First thing to do when jump starting ANY car is check the Owners Handbook. It will tell you how to jump start the car (if it can be jump started). BMWs are not particularly sensitive to being jump started (no more than any modern car) but they do have to be jump started in the right way

@phillhuddleston9445 2 жыл бұрын

Who would want to own a car that's so delicate and over complicated.

@jasoncarmona87 2 жыл бұрын

Will a duralast jump starter work?

@siadahpeter9989 3 жыл бұрын

I jumped start my 2003 bmw e61 and it's not starting any more What should I do

@jeanjacques9980 2 жыл бұрын

Where should you charge your car battery from? The battery? Due to covid I’ve only driven 300 miles this year. Many thanks.

@wendy_wendy2106 2 жыл бұрын

Do you connect your smart charger to the battery directly or to the jump terminals?

@dipbleu 3 жыл бұрын

Great advice, BMW doc!

@TheLau1996 3 жыл бұрын

exacly this happend for me with some mechanic did destroy all my modules.....was such a pain

@edmoniersdokes6544 3 жыл бұрын

How about 750li do I use same jump kit

@TheGIAURI Жыл бұрын

Listen bro I have bmw 2009 528i it's been parked 4 years .. two years ago I changed battery I had to tow it to shop and they replaced battery charged me 500 Now I used to start it time after time but today I need to move it and it battery is dead . Where can I buy that device what is the full name I really need help.. it is good battery it's just drains not completely but it can't start .. and I am afraid to jump it with other car.. at list what amp I it takes to start si I buy something that can set amp a on it.. I need help plz

@lifecentreeurope Жыл бұрын

And e46? Can I use jump leads or this little pack. Where can I buy a pack?

@adriangavan 3 ай бұрын

good advice mate thank you

@armedessential 7 ай бұрын

Hi doc, im looking to get a battery booster for my 140i but im worried the cables wont be long enough to reach the two points. Do you know if they are long enough to reach both positive and negative points? The cables all seem to be the same length

@arthursmith643 4 ай бұрын

Place red on positive and black on any ground of the car. There should be a bolt on the engine close by anywhere on the vehicle

@tiith 3 жыл бұрын

Thank you so much for this post. Subscribing to your channel ps. The explanation was perfect by the way!👍🏾

@DB-ru5qr Жыл бұрын

Well I’m late to seeing this and I jump started 2017 330i from the battery the old fashioned way. And nothing is damaged that I know of. Fingers crossed. But I bought the instrument in the video for future charges.

@JEtt4108 2 жыл бұрын

What about an E89? Same rules apply?

@mihailbuturuga788 3 жыл бұрын

What about E70 X5 2007?

@tombanes Жыл бұрын

I have a 2016 Mini Countryman S that uses the same IBS as most BMWs . I was proactively using a battery tester to test the condition of my MINI/BMW battery with 760CCA as I just bought this tester and wanted to test all my vehicles . I have no starting issues at all but after the test it showed battery voltage at 12.03v after sitting over night and with the system NOT "asleep". I tested at the battery itself. The tester showed GOOD- RECHARGE. So i went on an hour ride at highways speeds. Tested the battery again the next morning and it showed 11.99v - GOOD RECHARGE. Should I be testing at those JUMP locations in the MINI? Does MINI/BMW systems alter these test results? seems odd.

@snivesz32 Жыл бұрын

You can measure the battery voltage under the hood or in the trunk, the IBS isn’t in between either of these circuits. With the car running measure the voltage and make sure the alternator is working, but otherwise, 12.0v is 50% charged and if it won’t charge beyond 50% the battery is likely sulfated. Time to replace it.