{"id":2020,"date":"2019-07-23T10:12:39","date_gmt":"2019-07-23T17:12:39","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=2020"},"modified":"2023-03-28T23:56:13","modified_gmt":"2023-03-29T04:56:13","slug":"how-to-use-a-multimeter-on-a-car","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/how-to-use-a-multimeter-on-a-car","title":{"rendered":"How to Use a Multimeter on a Car"},"content":{"rendered":"

When it comes to troubleshooting problems with your car, electrical issues are often the trickiest to solve. When a mechanical aspect of your vehicle isn\u2019t working properly, there is not always a direct and apparent reason why. To identify an electrical issue, you\u2019ll need to use a multimeter to see whether or not voltage and continuity are present in your vehicle’s wiring. We\u2019ll explain exactly how to use a multimeter on a car in the rest of this article!<\/p>\n

How to Use a Multimeter for Dummies<\/h2>\n

\"Auto<\/h2>\n

If you\u2019ve never heard of a multimeter before, it is a tool that can measure voltage, resistance, and current. They are often digital, rectangular-shaped handheld devices that work by connecting probes to wires you want to test. When an electrical component of your car isn\u2019t working, it generally means there is a defective wire causing an open or short circuit.<\/p>\n

Identifying Electric Problems<\/h2>\n

How to find a short in a car with a multimeter?<\/h3>\n

Multimeters can help you distinguish exactly which wire isn\u2019t working, as you\u2019ll notice a lack of voltage from the defective wire. Finding a short is quite a tedious process and will require you to measure continuity to identify where a short circuit is occurring.<\/p>\n

Depending upon what unit you\u2019re looking to measure, you\u2019ll want to set the range and parameters for your multimeter. If you\u2019re going to test for amperage, make sure to always use the fused port for your probes. Otherwise, you can use the non-fused ports. When looking at your probes (or leads), the black one is negative, and the red one is positive. No matter what you plan on testing, make sure to apply the parking brake before you begin!<\/p>\n

How do you check the voltage with a multimeter?<\/h3>\n

If you\u2019re checking the voltage on your car, you will want to use DC voltage. 20V is the correct setting if you’re going to test your battery. Adjust the dial to the proper range\/setting, and connect your probes to whatever component you wish to get a reading for.<\/p>\n

You might also like: How to Read Car Wiring Diagrams for Beginners<\/a><\/strong><\/p>\n

How do you check a headlight or light bulb with a multimeter?<\/h3>\n

In order to test the wiring of your headlight, you\u2019ll actually need to find the ground wire. From the connector that attaches to your headlight, there are two to four wires. With two or three wires, only one of them is a ground wire, while four-wired connectors will have two ground wires. Whichever wire is connected to the chassis is the ground wire. To test it, you\u2019ll want to set your multimeter for resistance. You can place one of your probes on the ground wire and the other on your car battery\u2019s negative terminal. If you do not read continuity, you have a problem with the ground wire, meaning it needs replacement.<\/p>\n

How to test a car ground wire with a multimeter?<\/h3>\n

To test ground wires, you\u2019ll first start by measuring resistance. Test along the wiring to verify your reading is five ohms or less. If it exceeds five ohms, you\u2019ll need to test the wire further. Switch your multimeter to DC voltage and turn on whatever electrical component you\u2019re having issues with. Test the wiring once again to ensure the reading doesn\u2019t exceed 0.05V. If it does, you\u2019ll need to use a different place to ground the accessory or use a bonding strap.<\/p>\n

How do you check if a fuse is blown with a multimeter?<\/h3>\n

Troubleshooting a fuse is extremely simple with a multimeter. Set your multimeter to the lowest ohms setting and place your probes on either side of the fuse caps. Fuses don\u2019t have polarity, so the probes you use don\u2019t matter. If you have a very low ohms reading, the fuse is working great. If the resistance value doesn\u2019t change after connecting your probes, the fuse is blown.<\/p>\n

You can also test a fuse using a test light<\/a>. Turn the key ON and touch both sides of the fuse with the tip of the test light. If it lights up, the fuse is good. If it doesn’t, the fuse needs to be replaced.<\/p>\n

How to Use a Multimeter on a Car Battery<\/h2>\n

\"Auto<\/h3>\n

If you\u2019re having difficulty getting your car to start, one of the most common reasons is a weak battery. This is something you can quickly test with a multimeter, which will also give you an accurate idea of how much charge the battery actually has left. Testing your car battery first is a great way of ruling out a likely culprit for many electrical issues.<\/p>\n

When testing your car battery, you\u2019re going to test for voltage. Consequently, you’ll need to learn how to use a voltmeter on a car first. Start by setting your multimeter to 20V DC. You can connect your probes to both battery terminals, matching up each color to the same-colored terminal. If you can have someone turn the headlights on, do so now so you can get a better reading of what the car can actually handle. You\u2019ll do this with the car turned off.<\/p>\n

In most conditions, you\u2019ll have a reading somewhere between 11.8V and 12.6V. The higher the voltage reading you see, the more charge is left in the battery. A 12.5V reading would indicate a like-new battery almost fully charged, while an 11.9V reading would indicate that the battery will need to be replaced<\/a> soon.<\/p>\n

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Read more:<\/h3>\n
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\"7<\/a><\/p>\n<\/div>

\n

\"HOW<\/a><\/p>\n<\/div>

<\/div>\n
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How to Use a Multimeter on a Car Alternator<\/h2>\n

Another reason why your car won\u2019t start is a failing alternator. Unlike your car battery, this isn\u2019t a part that you can directly connect your probes to. Instead, you\u2019ll test the car battery once again. The alternator is responsible for recharging your battery while you drive, so by checking how your battery responds under various electrical loads, you can see if your alternator is the problem.<\/p>\n

To test your alternator<\/a>, you\u2019ll want to set your multimeter to 20V DC again. Make sure the vehicle is off before popping the hood. Match up the corresponding probes to their correct terminals on the battery (negative to negative, positive to positive). Check the reading to see where you\u2019re starting at. Hopefully, you\u2019re starting with at least a 12.4 reading.<\/p>\n

Now, you\u2019ll want to start the car. Check the battery reading once again. If you see a reading of fewer than 14 volts, then your alternator is, in all likelihood, the cause of the issue. If the reading is above 14 volts, turn on every electrical accessory you can think of.<\/p>\n

Things like your stereo, all lights, heater, and seat warmers are all good options here. You\u2019ll want to read the multimeter once again and see how much the voltage dropped by. If you have a reading above 13 volts, then the alternator isn\u2019t the problem. However, a reading lower than 13 volts means that the alternator can keep up and will need to be replaced.<\/p>\n

Using a Multimeter on Your Own Car<\/h2>\n

\"Two<\/h2>\n

There\u2019s no secret that identifying and solving electrical problems can be an absolute nightmare. Some vehicles have more than a mile of wiring (if you unraveled it all and stretched it out), meaning there\u2019s a lot of potential wiring that could go haywire. Finding exactly which portion isn\u2019t working will require a lot of effort, but it is well worth it once you finally fix the problem.<\/p>\n

If you want to test the wiring of your vehicle, you\u2019ll need to learn how to use a multimeter, as well as some car repair manuals<\/a>. To make your life easier, you can even find an how to use a multimeter on a car guide in pdf format to walk you through the process. With this, you can follow step-by-step instructions illustrating which component you should be testing and where to place your probes! Backed with a multimeter and a pdf instruction guide, you can tackle any electrical issues in your own garage!<\/p>\n","protected":false},"excerpt":{"rendered":"

When it comes to troubleshooting problems with your car, electrical issues are often the trickiest to solve. When a mechanical aspect of your vehicle isn\u2019t working properly, there is not always a direct and apparent reason why. To identify an electrical issue, you\u2019ll need to use a multimeter to see whether or not voltage and …<\/p>\n","protected":false},"author":26,"featured_media":2606,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[69,1579],"tags":[773],"class_list":["post-2020","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-tools","category-tutorials","tag-multimeter"],"yoast_head":"\nHow to Use a Multimeter on a Car - eManualOnline Blog<\/title>\n<meta name=\"description\" content=\"Electrical problems can be quite tough to troubleshoot. 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He also loves cats, Johnny Cash and Subarus.","sameAs":["https:\/\/www.facebook.com\/jee514","https:\/\/www.instagram.com\/rat_in_chief\/","https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title.jpg",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-150x150.jpg",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-300x169.jpg",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-768x432.jpg",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-1024x576.jpg",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title.jpg",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title.jpg",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-110x75.jpg",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-310x165.jpg",310,165,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-310x205.jpg",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-660x330.jpg",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2019\/07\/How-to-Use-a-Multimeter-on-a-Car-Title-1050x525.jpg",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":2,"uagb_excerpt":"When it comes to troubleshooting problems with your car, electrical issues are often the trickiest to solve. When a mechanical aspect of your vehicle isn\u2019t working properly, there is not always a direct and apparent reason why. To identify an electrical issue, you\u2019ll need to use a multimeter to see whether or not voltage and…","_links":{"self":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/2020","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/users\/26"}],"replies":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/comments?post=2020"}],"version-history":[{"count":15,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/2020\/revisions"}],"predecessor-version":[{"id":52529,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/posts\/2020\/revisions\/52529"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media\/2606"}],"wp:attachment":[{"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/media?parent=2020"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/categories?post=2020"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.emanualonline.com\/blog\/wp-json\/wp\/v2\/tags?post=2020"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}