How to test a car battery

How to test a car battery. Learn how to test a car battery. How to use a multimeter to test a car battery 12V. Starter motor and alternator. What happens to the battery voltage during car starting, running and charging. How to tell if the battery needs replacing.
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[@EngineeringMindset]

⚠️ *These videos take a long time to make* if you would like to buy Paul a coffee to say thanks, link below: ☕ PayPal: www.paypal.me/TheEngineerinMindset Channel membership: kzbin.info/door/k0fGHsCEzGig-rSzkfCjMwjoin Patreon: www.patreon.com/theengineeringmindset

[@quanubg]

???? COMMENT OLDER THAN VIDEO

[@EngineeringMindset]

Yes, we can comment on videos before they are made public

[@daman6160]

@@EngineeringMindset LOVE YOUR VIDEOS BRO.CAN I ASK YOU ARE FROM WHICH COUNTRY?IF YOU CAN DO A VIDEO ON YOURSELF ?

[@danielteyehuago1633]

Thanks for sharing it with us

[@olukayodeakinwale3587]

Old school tutoring. Plain and simple, no distractions. Good job!

[@pandaXco]

Oho, this is the most simplest to understand explanation of a car electrical system. If it is possible more of those car electrical wiring explation ECU and wiring diagrams? Thank you!

[@jasonbrown467]

ever make model and year would be different. schematics exist though, but it would be cool to see someone run through the theory of operation on any given common vehicle, now that you mention it

[@rockytoptech1308]

I thought testing and explanation of the battery voltage and starter couldn't possible be more simple but this video is absolutely amazing at explaining it in terms even my 9 year old can easily understand. Thank you so very much! 😇 Now I can simply watch this video with my little boy and if for some reason he has a question I can answer it or maybe and hopefully this channel will have a simple explanatory video that will answer his question as well. Love this channel!!! 😇💙

[@valentinaselektrikas]

If you have 11V or lower on your battery it does not necessarily mean that battery not functioning properly. It could be a generator fault, it could be discharged by other equipment or frequent starting.

[@ofcv1238]

100%, I thought the same. I am here to check charge of batter when NOT connected to alternator

[@bullohsemak8959]

I doubt with that cause if u connected multimter cross battery terminal it mean voltage of the battery not the system. Also vdrop is sensitive for some componnt for electronic like diode

[@valentinaselektrikas]

If you want to check battery. You do not use multimeter. First you must charge battery with battery charger. If battery do not charge it is bad. When battery is charged you test it with charge tester then confirm if it is bad or good. More advanced way of testing battery is by using programmable load. You can measure what is capasity of battery.

[@henryuseda1656]

Your the man

[@misskrys213]

This was actually a great video to give insight as to how things operate via the battery.. 👍 Thanks

[@mfawzi89]

This type of videos very useful for wide range of people, plus it is with great animation on this amazing channel 👍🏻

[@4WinterTires-uv1mr]

Very information and you have sum up the point real good. It made me not to hate calculation in electrical system course! Thank you!

[@jacksbackable]

Great basic description. I’m going to show my daughter, it’ll give her a good idea of basic components of the electrical system. Thanks 😊🇦🇺

[@EngineeringMindset]

Glad it was helpful!

[@mrstratau6513]

Excellent. clear & concise.

[@selfmade128]

You make learning so simple! Thank you

[@garethgareth8699]

Brilliant instructions.

[@jesinu]

I need to use this video to help teach my kids as they are new to driving and I think they need a basic understanding of the various systems of a car.

[@ColinRichardson]

I don't think "starter motors" will be a thing by the time my daughter learns to drive.

[@jesinu]

@@ColinRichardson yeah, it will be just motors.

[@williampowell230]

Temperature is sometimes to take into consideration. The colder it is outside, the lower the output voltage will be

[@gus473]

👍🏼 It's amazing you can have a driver's license without knowing this....! 😬✌🏼

[@rgruenhaus]

That's why they call it a DRIVERS license and not a mechanics license!

[@josearmandosanchezvaldez6624]

saludos desde mexico city....muy interesante informacion de carga de bateria........

[@JunPTechnician]

Thank you for sharing sir new supporters here

[@13thravenpurple94]

Great work 🥳🥳🥳 Thank you 💜💜💜

[@danielteyehuago1633]

Thanks for sharing it with us

[@TheUnclestein]

It's always good to check the battery (-) to engine (earth) voltage drop, as a bad connection here can give the symptoms of a duff battery.

[@dodgecityvanlife]

This was great thank you

[@hannahotoole1811]

So I just have to match the colours up if it is out of the vehicle and I’m testing it?

[@SaiKrishna-qp9jn]

Can u please make the next video on working of linear inductor motors

[@LatinoGrande]

What if while the engine is running instead of 14v it display 13.8? What exactly does this mean, a problem with the alternator , the battery or both?

[@ayyadew]

Please make a video about what is the difference between maintenance free led battery and normal led acid battery

[@PavelCapek-sq3hq]

Zdravím, mam dotaz , když má baterie pb 12V 60A, neměla by dávat při zatěži 6A , cca 10 hodin, oných 6A , než klesne napětí na 10v? jek je to s kapacitou a zátěží? děkuji za odpověd, Pavel

[@maksimmakarov9541]

Great job! Thanx for excellent explanation 👍

[@nickayivor8432]

KNOWLEDGEABLE The Engineering Mindset Thank you 👍 From Nick Ayivor from London England UK 🇬🇧

[@Gerard-oo8os]

Wow. I didn’t know that cars have a small generator inside. Cool.

[@mariondaisy5361]

Yeah I does have.

[@KeithWhittingham]

It's not a generator (DC), it's an alternator (AC)

[@robertsmith-cj6gl]

@@KeithWhittingham my 1960 Volkswagen had a six volt generator. It needed to be polarized when installing a new one

[@nagesh007]

Amazing , Thanks 😍

[@Kalo9543]

Battery also dampens spikes and stabilize voltage. If you remove the battery while the engine is running you can damage electronics since the battery is not available to absorb spikes in voltage.

[@karhukivi]

Very true!

[@SuzieQ333]

great video, thank you for your time

[@metalhalide4043]

Its always good idea to have jumper cables in your vehicle, batteries do not last more than 4 years in hot parts of the country, if your engine always starts on one click you will never know if your battery is weak and will give no warning when it fails..

[@bokkenrijder172]

Nice graphics! 👍🏻

[@user-ut5mj2ud8i]

very good job

[@mooghead]

My car stereo has a setting that tells me how much power the battery is kicking out, like the video says, pretty much bang on 14 when running

[@jimmyhuajh]

Should I turn off the engine when test the battery? Thx

[@zeshan144]

So if my car battery is 12v when ignition off, 11v when ignition on and 14v when engine on, there is nothing wrong with it? My car is not starting up first time and came up with battery light while trying to get it started but light goes off when engine does finally start up. Tested battery, spark plugs recently changed, what could the problem be?

[@_BSG_]

Nice information

[@riversaly]

If the volt doesnt go back up few seconds after starting, does it mean that the alternator has a problem?

[@tehranboys3525]

great education

[@sabaamiranashvili2334]

please keep upload videos ❤❤

[@Utopian_Turtletop-vn1iu]

Thank you for not using background music. This is how an instructional video should be.

[@mpetz-dt7ym]

what does it mean when my voltage goes to 16 while my machine is running?

[@lonestarhog7407]

Great video! Might have included the fuel injectors and how a weak system can cause start problems.

[@redpepper007]

So think twice before installing overpowered amps/subwoofers on stock battery and alternator... and maybe even throw in huge capacitor just to have one extra device for your vehicle to charge like it's not enough already :D There's just not so much it can provide extra taken into account what the car needs for itself.

[@mesaber86]

Now why do my grasscutter die when i remove the battery? It got an engine. Same for my ATV it doesnt run without a working battery. ATV even got a rope to start it but still it wont run without a fully working battery.

[@KeithWhittingham]

Good question. 1/ The battery provides a pretty well constant voltage with a large capacity to provide current so - a really good power supply. 2/ While a generator can provide electricity on it's own, an alternator can't - it needs a currently flow to produce power. You could, in theory build in large capacitors so that you could remove the battery when running but you would need to start the engine with a battery.

[@reverseflash7007]

the battery's current is measured in amps, and the voltage is fixed at 12V, for example .When we consume power from a 20A battery, we consume amperes , not voltages, so why do we measure the voltage instead of measuring the current?sorry if my question is stupid, but I'm just confused

[@jenellmaravilla3826]

Thanks mate...

[@boxingday11]

Thanks 👍🇬🇧

[@happycat0411]

It's always best to use a manual battery load tester! They're only about $20 and you will almost never use it. However, when you do need to use the battery load tester just before winter it will save you a big headache before the cold weather starts to kick in!

[@raybin6873]

The alternator charging will turn on and off while driving - the voltage regulator does this, to prevent from overcharging the battery. You can usually see the battery level gauge on dash move back and forth a little while driving. This will tell you charging system is working...if it doesn't, you may soon have a low volt situation...engine likely to start running erratically (as fuelpump and fuel injectors begin to falter).👍 Be familiar with your battery gauge operation and always monitor it while driving - that's what it's for!

[@rgruenhaus]

My 2011 Ford Fusion Hybrid does not have a start battery indicator on the dash. Only a dice battery level indicator. Working very nicely at 10 years old!

[@metalhalide4043]

Best to test battery with 100-amp load tester to see if voltage stays within range for stated amp battery otherwise you may get stuck somewhere..

[@raybin6873]

Unless the car has a manual transmission....you can "pop start" the engine if the car be pushed in nuetral...get it rolling then with transmission in 2nd gear (best of all) and clutch pedal held down...release clutch to turn engine. It's a good reason why I like manual shift vehicles (all 3 of my vehicles are).👍

[@s.j.5850]

Definitely! Just checking the voltage of a battery is not enough. You have to put a load on it to see if it can push those amps (for starting / turning over the engine) without faltering. Let's us not forget to have those battery cables & terminals clean & shiny & tight as well for starting. Small but critical details that are sometimes overlooked by the average car owner.

[@raybin6873]

@@s.j.5850 Paying attention to how well the starter cranks the engine can provide clue on battery condition...when slower cranking speed is noticed, that can indicate end of battery life is near (especially if charging voltage is normal). Also monitoring voltage drop when starting engine can be helpful. Knowing age of battery is also helpful...batteries have expected life of 3 - 5 years. 👍

[@raybin6873]

@@s.j.5850 Don't forget the alternator belt! I just recently noticed low voltage battery while driving...first thing I checked was the V-belt (had replaced several months ago)...it was loose! Tighten it...issue went away.👍

[@s.j.5850]

@@raybin6873 Yes, that too!

[@johngoard8272]

I have seen that you can test a battery admittedly an AA one with a 100ohm (5W) resistor in series with the multimeter set to current (amps) can you do this with a car battery to test how good the battery is??

[@Total-Solutions]

Using the AA battery as an example, that small battery would deliver a peak output about 4 amps for your test, 3-5 secs. The good car battery would deliver approx 700 amps or more. Do not attempt this as your connect leads will melt and your test meter could blow up in our face. The good battery will continue to deliver 100's of amps for some time. In your example of the AA battery consider to place the 100 ohms resistor across the battery terminals and safely measure the Voltage (rather than the current). Just measure the voltage with no load and then with the resistor. It's a judgment call to say if the battery is then good or not. 1.6v no load and 1.4v with load, its good. 0.95v no load and 0.6 loaded, not good. Why the difference ? Consider an additional resistor of hundreds of ohms inside the battery than start out being 0.005 ohms and over time goes up in value to 100 ohms. That internal resistance prevents the current flowing, as the battery ages.

[@karhukivi]

@@Total-Solutions A 100 Ohm resistor will not test a car battery, nor will it draw 700A. By Ohm's law the current I = V/R = 12/100 = 120mA.

[@EngineeringMindset]

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[@EngineeringMindset]

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[@modarelmohandis1174]

We are missed you 💓

[@EngineeringMindset]

🤗

[@modarelmohandis1174]

@@EngineeringMindset what happen if we connected the two terminals of the battery with a wire

[@USAV3T]

you say that once the car is running that the electrical needs of the vehicle are powered from the alternator but doesn't the battery continue to run all the electrical needs of the car always and the alternator is just providing more current to the battery for those needs as well as charging needs?

[@VictorGonzalez-mi5kd]

No as much as I understand. If you disconnect the battery of your car, when the engine is running, it will continue running due the alternator will supply the energy for the engine.

[@karhukivi]

@@VictorGonzalez-mi5kd The battery helps to stabilise the voltage at around 12V. If you remove the battery with the engine running the voltage will increase to 14.4V or even higher and this will help burn out the lights and other devices sooner than they should. I burnt out my radio because of a higher than normal charging voltage.

[@Pgan803]

If the Alternator is spoiled, can an engine runs on Battery Power Alone until battery is dead?

[@bullohsemak8959]

dont forget alternator also provide current to engine ignition system to spark fuel in stroke cycle.

[@patolorde]

I was charging another car battery with my car battery and my friend said if i push the gas pedal it would charge faster or more current is that correct?

[@stuungar3390]

Not by much, on idle revs the alternator is producing optimum voltage, it may increase very slightly with higher rpm but the electronics in the alternator remove excess voltage. When jump starting, I leave the engine on idle.

[@techalyzer]

This is pretty easy to test by yourself, just get a multimeter, on a well functioning alternator you won't see much difference at all. The alternator has a built in voltage regulator, otherwise when speeding up you'd fry all the lightbulbs and all the electronics. :)

[@stuungar3390]

@@techalyzer - well put!

[@EngineeringMindset]

Check our new Multimeter tutorial out ➡️ kzbin.info/www/bejne/ap2kqq2IrdiVesU

[@suyashrahatekar4964]

Please explain how a jumpstart works.

[@rcn9910]

A jump start basically puts the working battery of the donor car in parrallel with the dead battery off the recieving car. Thats why you connect red to red, and black to black.

[@JacobTJ1]

Why can't the alternator and starter be one and the same unit? they are both electric motor / generator correct?

[@2aminitials]

Starters are gear driven and mesh to the engines flywheel or flex plate (depending on the transmission type). Using the starter as an alternator would require constant engagement of those teeth and would be noisy and wear out the gears. The alternator is belt driven and would require a substantial belt capable of transferring high torque to start the engine. A belt system heavy enough would be a bigger parasitic drag on the engine as it is running as compared to a normal serpentine belt driving the alternator. You'd also need to deal with the current flow coming from the battery on startup and then switching to current going back to the battery if you used a starter / alternator combo.

[@JacobTJ1]

@@2aminitials great explanation thank you

[@dorkusmaximus3033]

Thanks!

[@EngineeringMindset]

Thank you, much appreciated

[@seasong7655]

I've heard some people would short the battery for testing

[@Robonza]

Shorted battery's can explode

[@casemodder89]

You could also put your fingers in the outlet to test the powerplant.

[@heyderaliyev8976]

exactly, it happened to me before, a well known car electrician in our town, used to check my car battery by shorting it to see if it gives big spark, if so then battery is good 😂😂😂😂😂😂

[@3613jeremy]

I didn't see anything about testing a battery a battery can have the 12v reading and still be bad because it's not putting out the required amps usually because of a weak cell

[@alializadeh8195]

Thanx

[@rayquaza396]

Sorry for such stupid question but can a car battery shock and kill you?

[@ruan2587]

There is nothing like a stupid question :) Nobody knows everything and always learn, but no you won't shock as the voltage is too low. Need much higher DC voltage closer to 50-100V to feel it and be dangerous. So for a 12V battery you are safe.

[@hamidizadi]

One thing that doesn't quite make sense is when both the alternator and battery are powering electrical components simultaneously, how can current travel in both directions in the negative ground battery cable connecting to the vehicle chassis??? If the alternator is charging the battery, then you have current going to the chassis from the negative battery terminal to be grounded but if the battery is also powering electrical components you have current flowing back to the battery from the negative ground cable to the negative battery terminal. How can you have current flowing in both directions at the same time??? I do not think the electrical demands of the vehicle will ever reach the point where the battery will kick in to aid the alternator in powering those components. Aren't alternator max amperage close to 100A. Can someone please explain this to me, would greatly appreciate it.

[@wakkowarner7391]

If it recharges like a capacitor then it's knackered.

[@rgruenhaus]

Some cars starter batteries are in the trunk like some newer Fords.

[@THELEGENDS-vg9lg]

How do you make the animations

[@EngineeringMindset]

A lot of coffee and late nights

[@mikedelta1679]

A charged car batterie puts out at least 12.6v. With the fuel pump fuse removed: - The battery voltage drops during cold cranking to around 10v. Cold cranking voltage varies with the temperature of the battery. A good battery will go back to 12.6v quickly once you stop cranking.

[@Sterlingjob]

What about testing battery capacity?

[@karhukivi]

Same thing. A dying battery is simply losing its capacity due to sulphating of the electrodes.

[@kevinmills5293]

You need to explain how to differentiate between a flat battery and a defective battery.

[@karhukivi]

A flat battery can be recharged fully, a defective battery won't charge properly if at all.

[@kallachnadra]

verygood

[@NaveenBalkumar]

To charge your car battery alternately, it is called Dynamo with Turbo Fan on top. free energy will be created and the battery will be charged.

[@NaveenBalkumar]

When car running fan will be rotated free enargy generated

[@ahmadtaha1242]

You forget to explain from where generator alternator is getting power to generate power in the stator

[@EngineeringMindset]

You can watch the alternator video for that, this is just how to test the battery

[@willspeakman2461]

Need to also test how efficiently the battery discharges possibly by measuring the amperage drawn to the starter.

[@peppermeat8059]

oh i thought the negative wire brings out the power and the positive brings in the used up power

[@mymechanicfriend6017]

If it drops below 9.6 volts...

[@rawbacon]

My battery is 8 years old and won't spin it over when it gets really cold.......I think I know its condition without any testing.

[@Jakub1989YTb]

Should have added, how to test for leaking current, and a warning, not to test the starting current with multimeter!

[@EngineeringMindset]

Check our new Multimeter tutorial out ➡️ kzbin.info/www/bejne/ap2kqq2IrdiVesU

[@minshum]

Are you the Headspace man?

[@EngineeringMindset]

Lol nope

[@trevorj203]

Definitely 100's of amps

[@CRiver396]

car battery link is not in the description . you lied.

[@massoudpn]

It could be better if you explained CCA too

[@brianwhelan5382]

If batteries are run on 15plus volts they don't sulphurnate

[@DarrellLicastro-qq3kl]

How does telling someone how a starter motor works got to do with testing a battery..da

[@EngineeringMindset]

Perhaps you didn't notice how it impacts the voltage of the battery? This doesn't explain how it works, but we do have an entire detailed video on that topic if you want to learn more.

[@priscillamontes2416]

if its below 12.6 it needs to be charged

[@kosmastsa2332]

The battery voltage at rest is 13.2v

[@chic0sanchez]

You've got to wait for around 5 hours after you've driven the car or charged the battery or else you will get a false reading.

[@mumunikokoro7627]

Master MUMUNI KOKORO car doctor

[@EdgarMartinez-ks1yl]

💯💯💯

[@donttrip5782]

I love you

[@gopinathbangar2448]

Kripya Apne Hindi channel pe video upload kar dijiye

[@juansantamaria1982g]

Recently my battery had 12 volts but it didnt cranck the starter motor, i went to servie and they tested my battery using a special tool that measure amps. So multimeters are not enough to test a battery...

[@Robonza]

I think he did pretty good as he stated to measure the voltage while cranking. The voltage drop during cranking will clearly show a weak battery.

[@EngineeringMindset]

The special tool is simply a multimeter connected to a resistor, to measure the current.

[@SystemX1983]

if you have a multimeter capable of measuring >100A, you could also measure the current drawn by the starter (if you know what you are doing) ... but I think most multimeters will only measure up to 20A before releasing some magic smoke or catching fire instantly ;)

[@Robonza]

I been working on cars for 30 years with a $100 fluke DVM. I have not got a battery diagnosis wrong yet. Any arguments mean its time to upskill

[@thomashemingson2639]

Battery's consist of some metals soaked in acid. As they age, a coating develops on the metals which reduces the ability of current to pass through the battery. Battery testers test for resistance. Testing for voltage alone is not sufficient. You can have a battery that shows 12.6 volts, but has I high resistance resulting in a weak battery. The only way to fix it is to replace the battery.

[@tramp2892]

Actually if it starts the engine first crank, the battery is good. If the voltage from the alternator is less than 13.8 Vdc, you got a charging system problem

[@juergenscholl2843]

Newer "intelligent" charging systems may put out only as much as 12.8 volts under specific conditions and this would be normal, iaw working as designed. The mentioned 13.8 volts is not a valid rule anymore, if it ever was.....

[@karhukivi]

If it is charging at more than 14.4 V then there is a voltage regulator problem and other electric/electronic devices could be damaged, e.g. radios satnavs, headlights etc.

[@bennson4631]

What you know about rollin' down in the deep? When your brain goes numb, you can call that mental freeze When these people talk too much, put that shit in slow motion, yeah I feel like an astronaut in the ocean, ayy What you know about rollin' down in the deep? When your brain goes numb, you can call that mental freeze When these people talk too much, put that shit in slow motion, yeah I feel like an astronaut in the ocean She say that I'm cool (damn straight) I'm like "yeah, that's true" (that's true) I believe in G-O-D (ayy) Don't believe in T-H-O-T She keep playing me dumb (play me) I'ma play her for fun (uh-huh) Y'all don't really know my mental Lemme give you the picture like stencil Falling out, in a drought No flow, rain wasn't pouring down (pouring down) See, that pain was all around See, my mode was kinda lounged Didn't know which-which way to turn Flow was cool but I still felt burnt Energy up, you can feel my surge I'ma kill everything like this purge (ayy) Let's just get this straight for a second, I'ma work Even if I don't get paid for progression, I'ma get it (get it) Everything that I do is electric I'ma keep it in a motion, keep it moving like kinetic, ayy (yeah, yeah, yeah, yeah) Put this shit in a frame, better know I don't blame Everything that I say, man I seen you deflate Let me elevate, this ain't a prank Have you walkin' on a plank, la-la-la-la-la, like Both hands together, God, let me pray (now let me pray) Uh, I've been going right, right around, call that relay (Masked Wolf) Pass the baton, back and I'm on Swimming in the pool, Kendrick Lamar, uh Want a piece of this, a piece of mine, my peace a sign Can you please read between the lines? My rhyme's inclined to break your spine They say that I'm so fine You could never match my grind Please do not, not waste my time What you know about rollin' down in the deep? When your brain goes numb, you can call that mental freeze When these people talk too much, put that shit in slow motion, yeah I feel like an astronaut in the ocean, ayy What you know about rollin' down in the deep? When your brain goes numb, you can call that mental freeze When these people talk too much, put that shit in slow motion, yeah I feel like an astronaut in the ocean

[@quanubg]

Below 1k Views!

[@jasonbrown467]

and since i watched your video about conventional current theory, vs electron flow theory i can see you used the wrong method in your animation, but you labeled it. lol. jk, i enjoy your work

[@robertdionne6073]

👍👍👍👍👍👍

[@arvindpandit7717]

Hindi me video banaiye

[@EngineeringMindset]

www.youtube.com/@EngineeringMindsetHindi