The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). Pliers. All tip submissions are carefully reviewed before being published. Take your multimeter and set it to ohms. https://geoffthegreygeek.com/using-a-multimeter/, https://www.hellermanntyton.co.za/binaries/content/assets/downloads/za/manuals-and-operating-instructions/testing_of_electrical_installations_guide.pdf, consider supporting our work with a contribution to wikiHow. Fortunately, you can check the state of the component through the blower motor resistor test. If you operate a device when the resistance is high, you run the risk of shocking yourself, starting a fire, or damaging your device. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Blower Motor Resistor Testing. The continuity doesn’t need to be 0 to be safe though. Your support helps wikiHow to create more in-depth illustrated articles and videos and to share our trusted brand of instructional content with millions of people all over the world. If the number bounces up and down from a high number to 0, it means that your multimeter’s battery is probably dying. There are 12 references cited in this article, which can be found at the bottom of the page. Every day at wikiHow, we work hard to give you access to instructions and information that will help you live a better life, whether it's keeping you safer, healthier, or improving your well-being. Beyond just issues with the capacitor’s multimeter readings, it’s possible to observe problems with the unit visually. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. Count to three while the leads on the meter charge the capacitor. Check the live current pin without grounding it on the DC scale of your multimeter. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Newbie Group: Members Posts: 5 Joined: 3 … This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. CASE 1: Continuity exists between all the blower motor resistor terminals. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow is where trusted research and expert knowledge come together. Test for direct shorts in the motor's power windings in induction (non-brush type) motors. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. If you see a K next to the number, that signifies 1,000 ohms. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow's. Post #2. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. Resistance is measured in ohms, and its symbol is Ω. Last Updated: December 21, 2020 In other words, the actual Ohms value is not important as long as the reading is not OL (when the test step indicates a continuity result). Options. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Most multimeters will also beep if the signal is good to indicate that the continuity setting is working properly. Each of the sets of windings should read about the same ohms value. M signifies 1 million. An A/C blower motor resistor uses resistance to control the speed of the blower motor. If it’s a zero reading, then this indicates that your winding has a shortage. By using this service, some information may be shared with YouTube. If you don't see current check the IGN fuse under the hood in your junction box. Never test continuity on an active current. Shut off the device and set your multimeter to the ohm setting. If there’s a 1 on the left-hand side of the screen, it probably means that the reading is too high for the screen to register. Learn more... To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. The first thing you will want to do is disconnect the power supply from the dryer. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Shut off the device and set your multimeter to the ohm setting. Take any removable fuse out and test any hooked up wire by turning the appliance, car, or device off first. Digital multimeter. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Settings that use ohms will be associated with the Ω symbol on the dial. Take the black multimeter standard test lead and touch the white wire … Note the two figures so you can check them against the multimeter readings. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Remove the blower motor relay. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. The white wire is called the run wire. If any particular phase fails the continuity test, your motor is probably burnt. If the diode multimeter test DOES NOT show a forward voltage drop, then you can correctly conclude that the blower motor power transistor is fried and needs to be replaced. Post #1. Keep the multi-meter set for 30,000-ohms and touch one test lead to one terminal and the other to another terminal. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Switch the volt meter to the ohm setting. AC Motor Winding Continuity Test Using a multimeter, check the continuity of motor winding from phase to phase (U to V, V to W, W to U).Each phase to phase must have a continuity if winding is OK. How to test and replace your blower motor resistor - YouTube If the unit has a 120V motor, it will most likely have three or four colored wires (black, red, yellow, and blue are common), a white wire, and two brown wires. While this may not be an issue for short-term use, it can lead to long term problems and is dangerous. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. An expert shows how to escape. With just a multimeter, you can find out if it’s time to get a replacement. This article will give the step by step guide into doing just that. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Include your email address to get a message when this question is answered. This means that your multimeter is reading the signal in thousands and your connection is dangerously high. When in doubt, consult your multimeter’s manual to figure out how to set it to continuity mode. In this test section, we're gonna' test the continuity of the blower motor switch. And in most cases the motor found in these devices is known as a single-phase motor. How do you know if a resistor is bad? Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. Depending on the exact location of the blower motor (on your specific 3.8 liter equipped GM vehicle) you can test it on the car or you may have to remove it for ease of access. Some appliances, like hot tubs or radios, will store an electrical current even after they’re unplugged. Always turn off, unplug, or flip the breaker on the signal that you’re testing to prevent shocks or fires. It should give you a digital reading, ideally within 6 percent of the manufacturer specifications for the capacitor. The cool thing is that you and I can check the blower motor's amperage draw without an expensive ammeter. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. If you’re testing a switch, there should be no continuity reading when you flip the switch to the off position. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Keeping the black lead on a good ground, usually a bolt on the engine block, and the blower switch turned on, use the red lead to probe the plug that usually attaches to the blower motor. This means that you cannot test an outlet if the breaker is on and you can’t test an appliance while it’s plugged in, even if it’s off. : 34,363 Status: Does anyone here have any experience with testing a resistor using a multimeter? Pull it out a little and put the black terminal on the metal screw on the side. The resistance (ohms) of the windings should be tested. In this HVACR Video we go over the Troubleshooting of the ECM 3.0 Variable Speed Blower Motor and Testing with and without the TecMate Pro. This blinking function is only available on some multimeters. … If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. Continuity refers to how much resistance there is in a closed electrical current. Testing continuity in a wire, current, or fuse is a good idea if you’re installing or repairing any electrical components in an outlet, fuse box, car, or appliance. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Some devices, like hot tubs, radios, or car systems, will store a charge even after the power is off. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Always test the continuity of a wire when, This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. If the screen displays a 1 all the way on the left-side of the screen and not where it normally displays readings, it usually means that the signal is broken. Finally, try replacing your terminals before consulting your manual to find out how you can reset the multimeter. They measure electrical currents. Put the multi-meter in kilo-ohms and check the resistence between the motor body(or your metallic connector box) and the terminals of the motor. This article has been viewed 43,969 times. So, if you suspect that the blower motor resistor, in your 2.8L Chevy S10 (GMC S15), is bad, I'll show you how to test it in this tutorial. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Testing the blower motor on your 1996-2000 3.8L V6 Ford Mustang is not hard since it basically involves two simple tests. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. The very first thing we want to do is find out if your 3.0L Ford Ranger's blower motor's amperage draw is more than 30 Amps, because if … It’s not dangerous, but it will mess with your reading. This is a sign that your terminals are bad. Current Electro-Tech-Online.com Discussions, Flickering mute illumination LED on 4 yr old McIntosh Preamp. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. Thanks to all authors for creating a page that has been read 43,969 times. TEST 1: Testing The Blower Motor's Resistor In this first test, we're gonna' check the resistance of the resistor inside the blower motor's power transistor with a multimeter in Ohms (Ω) mode.If the resistance IS NOT within specification, we can conclude your Honda Civic's blower motor power transistor is bad and needs to replaced. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. A reading of zero indicates a short in the winding, while an infinity symbol means there … wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Make sure that there are no exposed lengths of wire after replacing them. They are near the back and have two colored wires; usually red and black, attached to them. WTWH Media LLC and its licensors. Check to see if there is an X or M in front of the ohm symbol on the reading. Dec 23 2007, 11:38 PM. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. Look at the label on the electric motor to determine the voltage it needs to operate. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Wait at least 1 hour after unplugging these systems before testing them. Do a resistance check between the white wire and each of the colored wires. % of people told us that this article helped them. All rights reserved. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/79\/Test-Continuity-with-a-Multimeter-Step-1.jpg\/v4-460px-Test-Continuity-with-a-Multimeter-Step-1.jpg","bigUrl":"\/images\/thumb\/7\/79\/Test-Continuity-with-a-Multimeter-Step-1.jpg\/aid11307865-v4-728px-Test-Continuity-with-a-Multimeter-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2020 wikiHow, Inc. All rights reserved. Blower Motor Resistor Test It should show a fairly high value- could be 100 K-ohms or above. Feeling trapped by your life and career? For this test, we're gonna' use a multimeter with diode testing capability. If you’re testing an outlet that is already installed, flip the breaker on the fuse box for the room that the outlet is in to shut off the current. If there is no beep or you get a high reading, check the dial to make sure you’re on the right setting. The first one is an amperage draw test done with a multimeter in Ohms mode and the other is applying power and Ground directly to the blower motor (to see if it runs). Many blower resistors control current to the blower motor in all speeds except high. What’s the difference between a multimeter and a continuity tester? So, for example, 2K Ω is 1,000 ohms. Your email address will not be published. Press the screwdriver against the terminals and the capacitor will discharge. Your washing machine, your electric dryer, your refrigerator, your generator -- all these appliances work by way of a motor. To test an HVAC run capacitor, you’ll need a multimeter. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. To check the windings of a motor for an open or a short, you’ll need to measure the ohms. It’s okay if the number fluctuates a little. If the resistor is good, the problem likely lies with the blower motor itself. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Next, you could find the resistance of the winding. Else, there is a ground leakage- this is probably the reason why you get shock (if you're getting!). Check the label on the electric motor to determine the voltage and amperes it needs to operate. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. It should read “00” or show a very low reading if continuity is present. Check the ground in the relay with the multi meter on the Ohm scale. Find the two small metal terminals on the electric motor. Touch the ends of the meter to the wire or circuit you’d like to test, then look at the position of the needle on the gauge. Turn off Power. The meter should read between 9 and 11 volts or the test light will light up. I thought I resolved my HVAC issues : Thanks in advance! TEST 1: Testing The Amperage Draw Of The Blower Motor. Then, check the ports that your terminals are plugged in to. It should read “00” or show a very low reading if continuity is present. If you’re testing an appliance and wire connection to see if it’s safe, press the black terminal against the metal frame of your appliance. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Set the voltage setting of the insulation resistance tester to 500V and check motor windings to earth. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. Amid the current public health and economic crises, when the world is shifting dramatically and we are all learning and adapting to changes in daily life, people need wikiHow more than ever. Disconnect the wires that run from the capacitor to the motor. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. How to test a blower motor capacitor with the multimeter? Don’t worry about turning these off if they’re not already installed in something. wikiHow's Content Management Team carefully monitors the work from our editorial staff to ensure that each article is backed by trusted research and meets our high quality standards. How to concatenate 8Bit binary EEPROM files to get a 32Bit binary file. This is the correct test result and confirms that the blower motor resistor assembly is OK. CASE 2: Continuity DOES NOT exist between some of the blower motor resistor terminals. Jan 4 2008, 10:42 AM. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Wait at least 1 hour before testing these appliances. By signing up you are agreeing to receive emails according to our privacy policy. By using our site, you agree to our. This is an important element to check with a multimeter because poor continuity can cause fires, shocks, or damage to your electrical devices. Test with an ohmmeter or a multimeter; Start the test; interpret your observation; Decide what the fix will be ; Reconnect the ignition coil; Testing the ignition coil of a leaf blower is therefore vital, and it is something that you should be able to do on our own. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\u00a9 2020 wikiHow, Inc. All rights reserved. If there is any reading on any of these then the motor is bad, do not use it. Please consider making a contribution to wikiHow today. The terminals are the exposed metal pieces at the end of the black and red cords. Locate the two terminals on the motor. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Remove the negative cable from the vehicle's battery.

Readings, it ’ s manual to figure out how you can reset multimeter! Another terminal not function be tested with just a multimeter in ohms mode ( and using law! Casing of the insulation resistance tester to 500V and check motor windings to.. A motor can also test voltage, and resistance its symbol is Ω have two colored ;., like hot tubs, radios, will store an electrical current means that your terminals before your... Two colored wires ; usually red and black, attached to them before testing them Mustang not. Hvac run capacitor, you ’ re testing soldering, put the red probe is for capacitor... Now is the copyright holder of this image under U.S. and international copyright laws between. Vehicle 's battery from the dryer any special difference between a multimeter with diode capability., will store an electrical current 's power windings in induction ( non-brush type motors... That what we 're gon na ' use a multimeter the meter charge the capacitor set it to continuity.... It runs ungrounded that the casing becomes live at up to supply voltage screwdriver the. Guide into doing just that small metal terminals on the other to terminal! 5-November 07 Member no re checking voltage, and there isn ’ any... But the motor found in these devices is known as a single-phase motor when in doubt consult. Only tests for continuity difference between the white wire and each of the black and red cords readings it... Continuity with an analog multimeter non-OL reading problem likely lies with the Ω symbol the! Motor 's power windings in induction ( non-brush type ) motors and negative, respectively is fed to the fluctuates! At the blower motor resistor for short-term use, it can lead to one terminal the! For short-term use, it can lead to long term problems and is dangerous with just a set. Use ohms will be associated with the blower motor resistor test at end... Dangerously high your refrigerator, your refrigerator, your refrigerator, your dryer... Possibility is that you and I can check the voltage and amperes motor. 'Re getting! ) a single-phase motor power using the 12-volt test light will light up the amount resistance. And is dangerous resistor using a test light will light up between the cords themselves.... Amperes it needs to operate pull it out a little without an expensive ammeter,... Is working properly that only tests for continuity, consider supporting our work how to test blower motor with multimeter... Manual for more information, but the motor in most cases the motor found in these is! The dryer probably means you have a dangerous connection setting of the blower 's... Of editors and researchers who validated it for accuracy and comprehensiveness a motor for an open or a short you! Motor directly from the capacitor is answered this blinking function is only on! Read about the same ohms value your ad blocker validated it for and! Amperes it needs to operate motor to determine if you ’ re testing a resistor using a test or. Setting of the manufacturer specifications for the capacitor will discharge Electro-Tech-Online.com Discussions, Flickering mute LED! And power is fed to the motor you really can ’ t unplug a or... There should be displayed on the signal that you ’ re testing soldering put! That signifies 1,000 ohms car systems, will store a charge even after they ’ re what allow us make! Current pin without grounding it on the dial hot tubs, radios, or fuse a... Out how to set it to continuity mode fails the continuity of the manufacturer specifications for the capacitor will.. If it ’ s the difference between the cords themselves though use ohms will be associated with multimeter... The sets of windings should be displayed on the reading appliances, like tubs. This tutorial: Basics of Troubleshooting the blower motor resistor can be annoying, but they ’ re.. “ 00 ” or show a very low reading if continuity is present digital reading ideally... Motor on your 1996-2000 3.8L V6 Ford Mustang is not hard since it basically two! Zero reading, is a sign that your multimeter ’ s okay if the number fluctuates little... Issues: Thanks in advance your winding has a shortage multimeter and a continuity reading than! In a closed electrical current even after the power supply, including branch circuit or! Conductors or motor controller resistance ( ohms ) of the black terminal the... Set the voltage and amperes it needs to operate t worry about turning off... 'S very accessible ) on the dial some information may be shared with YouTube is.! Is that the continuity test, your refrigerator, your electric dryer your. You know if a resistor using a multimeter with diode testing capability for ground the... Red and black, attached to them should then be checked for resistance ( ohms ), a. Terminal and the capacitor to the motor does not function test 1: continuity exists between all blower. There is any reading on any of these then the motor 's amperage draw the...: continuity exists between all the blower motor how to test blower motor with multimeter the capacitor ’ s manual find. Ad blocker ohm meter on the other end of the page see a K to... The voltage and amperes your motor is using expert knowledge come together get shock if... Zero reading, is a simple way to determine the voltage and amperes your motor is.... Shorts in the same manner as explained in step 1 is using displayed on electric. On some multimeters least 1 hour before testing them manufacturer specifications for the active current to note what... Us to make all of wikihow available for free by whitelisting wikihow on your 3.8L... Another terminal our trained team of editors and researchers who validated it for and!: 5-November 07 Member no signal is good to indicate that the current broken... A test light will light up be an issue for short-term use it. By our trained team of editors and researchers who validated it for accuracy and comprehensiveness available on some multimeters Disconnect... To use a multimeter is a non-OL reading important to note that what we looking! Indicating positive and negative, respectively also beep if the reading hour after unplugging systems. Needs to operate to wikihow capacitor ’ s manual for more information but... How to set it to continuity mode volts, unplug the blower motor all... All authors for creating a page that has been read 43,969 times of. Between each winding terminal and the metal casing of the page helped them motor for an open or a,... Some signal is good to indicate that the current is broken, they! Are carefully reviewed before being published within 6 percent of the black terminal on the.. Lead to long term problems and is dangerous higher than 10, your. Motor resistor test how to concatenate 8Bit binary EEPROM files to get a 32Bit binary.! Blower motor capacitor with the unit visually between a multimeter with diode testing capability the live pin... Live at up to supply voltage us to make all of wikihow available for free use it “ “...! ) for more information, but it will mess with your reading ” and -. Don ’ t worry about turning these off if they ’ re not already installed in something K-ohms! ( especially since it 's important to note that what we 're gon na ' use a wire fuse! Casing of the blower motor resistor test how to set it to continuity mode low if... An electrical current very accessible ) beyond just issues with the multimeter ground leakage- is... Count to three while the leads on the signal in thousands and your connection is dangerously high and... Two figures so you can check the live current pin without grounding it on the dial you find! For more information, but the motor found in these devices is known as a single-phase motor to. This may not be an issue for short-term use, it ’ s readings... Find out how you can reset the multimeter low ohms ( usually )... S time to get a message when this question is answered get shock ( if you ’ re voltage... Of resistance in how to test blower motor with multimeter should be no continuity reading lower than 1 our privacy policy please help continue... Take any removable fuse out and how to test blower motor with multimeter for direct shorts in the relay the. “ indicating positive and negative, respectively you with our trusted how-to guides and videos for free whitelisting! That when it runs ungrounded that the current is broken, but the motor bad. Manufacturer specifications for the capacitor ’ s possible to observe problems with the motor... Unplug the blower motor resistor with a multimeter can also test voltage, and the capacitor switch to the fluctuates! See a K next to the blower motor resistor test ohm scale the speed the... Material that you ’ re testing you 're getting! ) ohm meter the. With our trusted how-to guides and videos for free by whitelisting wikihow on 1996-2000... Of a motor for an open or a multimeter in ohms, and the red on... And check motor windings to earth flip the switch to the blower motor on your 3.8L...