How To Test Automotive Battery & Cranking Amps With A Multimeter




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TekReview's: Battery Jumper box is nice to have when car bat is dead and nobody can help you with jumper cables. Campbell makes them can get one at Walmart for like $35 USD. One cable to battery and other to metal somewhere on engine. Cranks right over. And Battery Buddy uses a Lithium Ion battery to store enough juice in case car bat is dead it will crank over your car.

Morahman7vnNo2: But wait, what about checking the amps?

TekReview's: My 02 Civic Honda battery had removable caps for service and most do not know that you can check the level in the cels, I had to add more distilled water to the battery to keep it in good shape. Had it for 8 years before I got it replaced. Just wear safety glasses and gloves to be safe.

ABflanagan523: Can't seem to find someone to answer this question. Well, with a fully charged battery. When you insert the key in the ignition and turn it, the battery voltage drops (as indicated by your multimeter). From what I saw, the voltage dropped to 10v then jumped back up, you said anything lower than 10v is not a good sign. So my two questions are. Why does the voltage drop when you start it and could you go over why anything below 10v is not good and what could be the cause of it. Thanks!

TekReview's: How about a video on making your own Super Capacitor board with LiPoly battery backup. Saw a dude do this to a Mazda, he no longer uses a car battery. The Super Caps hold energy a long time, and cranks over just fine even in cold weather compared to a cars normal lead acid battery.

Eric Cable: Thanks for the video. I think I will try replacing myself instead of paying soneone.

ahlishere: I thought you were going to show us how to find out what the cca was on any battery. :(

Fake Man: Great video man! Saved my ass!

Odysseus Ithaca: Thanks Johnny!

cameron cadogan: it sounds to me like the solenoid for the starting motor ain't moving the rotor 

Asphyx1ation: Why did you put the battery on the floor? You do know that putting any battery on the floor discharges the cells. I actually went to school for automotive and they said ABSOLUTELY not to put a car battery on the floor, your battery will drain faster. usually car battery's last about 3-5 years, that battery will probably last about a year and a half or maybe two years. Their was test's done by this at the ASE Academy. Other than that Very Great Video! Makes me remember high school day's when I took automotive classes.

pinoyeh: Informative video, but, you forgot to record the saved FM stations from the car radio. Oh by the way, I still have the original factory battery from my 2006 Mazda 3, and it is still alive and kicking......

sam ayar: ur video saved me well over £500. big thanks

sam ayar: hi great video a lot of help.thanks my car reading during crank was 6.5.it would not start and the maintenance free battery has a small window with a green light inside,so im not sure if the battery if at fault or the starter! 

LiarWithFire: really helpful, thanks for posting!

Joseph K.A: Good simple video.

Yevgen6R: Thank you for the lesson!

Derek Miller: Yeah that's not showing how to measure amps at all. Just voltage drop when under load.

KC2DAA: Nicely done video, you make mention of shorting out the battery but then remove the positive lead first. I would suggest the safest method is to remove the negative lead first effectively isolating the battery from the rest of the vehicle.. 

renoel55: Only one comment ... Jewelry on hands should be removed prior to performing any sort of electrical work, automotive or otherwise.

DizThaWhiz: Articulate, informative and easy to understand. Thank you man

Johnnysshop: Just a standard battery.

talkntribe: @Johnnysshop Thank You for replying. I took a multimeter and set it to 10A. Found out that the meter is reading 0.60-0.65. I definitely have a drain somewhere.lol. Now, I have to figure where. Thanks helping :)

Johnnysshop: Thanks for watching!

Johnnysshop: True

roon demahom: I likes these type of video clips. Excellent presentation. Short & sharp. Easy to understand & very informative theory & practical. Thru my best of experience in this field, I'll give to Mr. Johnnysshop rated nine stars over ten stars. Double thumbs up to Mr. Johnnysshop. You done a good job. Keep it up your good works & bring out all your best of experience to everybody. Once again thanks for your very useful info.

freestyletube: Get interstate or die hard best batterys in market

nthankx: as you say show about AMPS but your video describe only Volt so pls change your heading......

ofromva: Eric The Car Guy said to use the amp setting. Should i use volts or amps? Sorry idk much about electrical systems. I dont want to mess up my new multimeter

Adrian Wilson: Damn, dude nice vid.

louisfriendhastaste: No. THANK YOU.......that was really useful, now I know what settings and levels to look for.

Johnnysshop: Thanks!

fb3333: hi, great video, but you made one important safety mistake. when connecting the terminals, you should always connect the positive (red) first, so there is no risk of the arking out as you mentioned, and disconnecting the battery terminals, negative (black) must be removed first as you rightly done.

bruno2260: You didn't clean the cable ends or grease the terminal connections! Also if you didn't install the battery box up-side-down it would accommodate the battery handle. Put the box in 1st (flange side down). Then drop the battery in. If you are that concerned about the handle height just zip tie it to the battery bracket and It wouldn't stick up no higher then the bracket bolts. Btw where's the cover @ 3:20, forget to put it on last time? Ha, ha! Anyway you did do good with the meter. Thumbs up.

Johnnysshop: Thanks for watching!

CK: Good vid!

Johnnysshop: Sounds like it is for sure.

Johnnysshop: Thanks. The battery on concrete thing is a myth. Had one stored in my garage for 2 years.

Veclenit Tavuc: good video thanks :P

Boris theBlade: Yo, i used your video and went and tested mine. When the engine was off i got 12.67, when cranking it dropped to 10, and running it was at like 13.95. The last reading, is that bad? im sure it should be 14.4?

Johnnysshop: @altpath Hmmm.. I doubt it's either. Now if it wants to die when you turn the lights on that could be the alternator.

Justaguy913: Ok.... one dumb question XD I know larger trucks and some cars have bigger batteries. Does your '05 Altima have a larger than normal battery? You read about 12.3 volts on the meter... and said it was about half charged. Do you have a 24 volt battery.... or a standard 12.6 volt??

snnnoopy: Okay, I'm a little slow here so bare with me. So, the reading BEFORE the car starts is the COLD cranking amps and cold cranking amps is for 0 degrees F. Right so far? So, how do I know if my car will crank at -20?

kenny50776: @rpruneau68 That is what I had to say. The way he did that can blow the battery up in hi face or anything else close by.

Johnnysshop: @digdogitty Thanks, I appreciate the feedback. Yeah, I never trust a battery no matter what it reads because the load value is what really counts. Wish you would have seen it first also! Alternators can be a pain.

Johnnysshop: @confederatetexan1 Thanks!

Imre Csoka: Brilliant Video, i have an OPEL CORSA vehicle ( formerly from Delta and now General Motors ) 1.6 ie and i have also learned about batteries a bit and wanted to know more about how to measure the amps. I also learned that at 12.3 its not really enough to start the car. 12.6 is very good. As you say though, its more about the actual amps.

Daniel Alpert: Yes, correct. Always remove negative first and reinstall ground last. That way if you do short the wrench across a piece of metal under the hood the battery doesn't cause a spark. I've seen metal melt instantly by accidentally touching the pos post to a ground source. If the negative cable is removed first then this won't happen.

Johnnysshop: @ccipherscope Thanks for watching!
Rating:
How to Test Automotive Battery & Cranking Amps with a Multimeter 4.6 out of 5

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How to Test Automotive Battery & Cranking Amps with a Multimeter