How to Use a Multimeter to Diagnose Car and Truck Electrical Problems

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Its an electrical diagnostic tool every DIY mechanic should have. You all know by now that electronics are the backbone of modern cars. Every component ties in to the computer system! A multimeter is a basic tool to measure critical aspects of a digital electronic system: voltage, resistance, current. A small fluctuation in these parameters could wreak havoc on electronic vehicle systems! This video shows you the basics of using a multimeter to diagnose several common electrical problems in your vehicle.
Here are some things you can do with your multimeter!
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⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[@1AAuto]

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[@tubetime39]

Be nice to have a ballpark idea what readings should be ie on amps and fan test you spoke about you said maybe 4 amps on old fan and 2 amps maybe on newer fan. My was thought is higher better but have no idea if 2 thru 5 amps or whatever is good or if 0 would indicate bad along with 6 or more being bad ???

[@davidweum]

I tested my battery which showed perfect voltage. So, I figured I had a different electrical issue. I looked and looked and tested everything I could think of. It was -30°F in Alberta for 10 days in January 2020. It turned out I needed the battery test you mentioned which told me my battery had two cells that were bad. I learn something everyday. But, I wish I'd known about the "true" battery function test. Until I took it to a battery shop I didn't know of this other, true battery test. David Alberta

[@evannewton8721]

Thank you very important

[@Genetixxxxxxxxx]

Decent video. Felt a little rushed and incomplete. More detail while keeping it simple. Thank you for the video and all your efforts you have been a big help to a lot of people. Do not be discouraged we love your videos, keep them coming.❤

[@cardo1111]

Good vid on using a tool that many are intimidated by.

[@shawnwithee6336]

You nailed it describing me.

[@homeboy391]

Auto electric for dummies...so grateful for these videos!

[@bsir2004]

Love this video that make me understand more about the usage of DVOM. An automotive student from Canada. 31-07-2023

[@eunicemisedzi5469]

What l like most of you is the way u talk the way you take time,bless you good teacher

[@MD-cy8op]

Good explanation Please upload about ignition coil ohm's and ampere.

[@LeIeI0]

The one and only, your friend and mine, the Digital Multimeter.

[@1AAuto]

+LeIeI0 Thanks for checking us out!

[@johnmcgarry4191]

Got to say iv been trying to diagnose my fan in my car and for time now iv been struggling to find out how to use a multimeter and I think for any info out there about this subject your at the top for making things easy for the common man honestly thats off the to bro I'm away testing everything on my mini r53 as it's a old car and I hate paying to get stuff done I'm able to do with a little direction from old Google lol and people like you guys a1 auto grate stuff guys

[@ElisaHall-v5m]

It would have been helpful if you could have put in some real life examples on when you would do each type of test say for instance if you're installing a stereo what test you may need to do at that time or trying to fix it 12-volt Outlet

[@Baneslayer]

Great video, super helpful for me. Thanks!

[@MB70855]

Great video Thanks for sharing the info.

[@danielwillett7164]

For the resistance test of the connector, aren't those connection points for two different wires? Wouldn't you put both probs to a single connection point rather one prob on one connection and other to the second connection on the connector?

[@jg1468]

Should I get a voltmeter or multimeter as a beginner mechanic

[@rossadams3077]

Excellent explanation. Thanks

[@hawkology2786]

That's great. But what if the wire is hooked up in the car/truck??? Not just a wire laying around.......... A little helpful but definitely missed the mark. I'll find another video guess.

[@yeltsinrodriguez8722]

Thanks you guy are the best. Do you have a school program? that a great idea

[@robert63634]

When testing auto parts does it matter which side you put the leeds on when testing continuity or volts?

[@BennyMansour]

What's the best automotive meter

[@familyceo4227]

hey.. happy tosee you are stiil around making videos.. you rock.

[@sniperpaintcorrection]

Can this be used to test connector plugs ? My coolant plug got wet and I wanna make sure it works probably after I dry it and plug it back into the sensor

[@poorpuritan8480]

Super helpful. Thank you.

[@1AAuto]

+Poor Puritan Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

[@ecash00]

Can testing the FRame continuity to the + side wire, still work to test for Wiring short, with the Current Computers in cars? I know it wont work on the relay based connections.

[@rosaramirez2036]

Dumb question but…. I connected the multimeter to my car battery and immediately my interior light and the clock lit up. But nothing was captured on the multimeter. Would you know what causes that. I’m trying to diagnose where the battery drainage is coming from because I charge the battery and then hours later it’s back to normal. Thank you in advance 😊

[@iankerr1549]

I would try testing the connector for the interior and wiggle the wires along the harness. Wire could’ve rubbed and is now intermittently shorting out. You can either check the voltage, or try homing out the harness. You’d need access to the whole length of wire from beginning to end though

[@johnfranco5519]

great job

[@vector240]

When testing amperage draw (such as the fan motor example) doesn't the fan have to be running- actually drawing amps??

[@backyardbuilds12]

Can u show how to test 3 or 4 pronged connector and sensor

[@BennyMansour]

Are all millimeters the same

[@miltonmartinez6811]

Hi! I want to test crankshaft position sensor ! How can I do that? Thank you!!!

[@iankerr1549]

Ohm it out

[@larryavilez8060]

So when testing on 20 k is testing the ohms I was wondering why on the meter it's doesn't say OL

[@charlescoker7752]

Do they have a video showing how to test House wall plugs, and wiring circuits?

[@1AAuto]

+Charles Coker Thank you for your question. Typically our How-To videos are for automotive repairs. You could try looking on youtube.

[@seangowan7441]

Is a car built-in voltmeter not as accurate as a multimeter?

[@defnotcam9166]

Anyone know how to move the decimal point over? It’s unclear

[@roberts1159]

Decimal point is determined by the range you have the meter set. A lot of multimeters are auto ranging meaning the meter figures out proper range for voltage, ohms, and amps. Suggest spending a little extra money and getting one like that if you are serious about learning how to use a test meter.

[@maycast332]

What if my battery is in my trunk 😢

[@1AAuto]

+Maygen Castorena This procedure might be different for your application. We do not currently have a how-to video for this particular year, make and model. Thank you for asking! 1aau.to/m/Shop-1AAuto-c

[@ma3stro681]

“There are …” not “There is …” my man …

[@rob4673]

How do you test carburetor with multimeter

[@eunicemisedzi5469]

What l like most of you is the way u talk the way you take time,bless you good teacher