This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Newbie Group: Members Posts: 5 Joined: 3 … 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. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. 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. Jan 4 2008, 10:42 AM. : 34,363 Status: Does anyone here have any experience with testing a resistor using a multimeter? The meter should read between 9 and 11 volts or the test light will light up. If you’re testing a switch, there should be no continuity reading when you flip the switch to the off position. The continuity doesn’t need to be 0 to be safe though. Current Electro-Tech-Online.com Discussions, Flickering mute illumination LED on 4 yr old McIntosh Preamp. 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. By using this service, some information may be shared with YouTube. You obviously can’t unplug a wire or fuse. They are near the back and have two colored wires; usually red and black, attached to them. 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. Using Multimeter To Test Blower Motor Resistor. If your car’s blower has only 4 or 5 different speed settings, it likely uses a simple electric resistor to control the fan’s speed. Now is the time to test the white – brown and white wires. Turn off Power. Make a note of the voltage. Dec 23 2007, 11:38 PM. Take your multimeter and set it to ohms. Check the ground in the relay with the multi meter on the Ohm scale. To check the windings of a motor for an open or a short, you’ll need to measure the ohms. 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. % of people told us that this article helped them. This blinking function is only available on some multimeters. The terminals are the exposed metal pieces at the end of the black and red cords. They measure electrical currents. If any particular phase fails the continuity test, your motor is probably burnt. TEST 1 will explain how to check it with a multimeter in Ohms mode (and using Ohms law). Digital multimeter. Please consider making a contribution to wikiHow today. This article has been viewed 43,969 times. The first thing you will want to do is disconnect the power supply from the dryer. You can use a multimeter to check the voltage and amperes your motor is using. Pliers. 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. Settings that use ohms will be associated with the Ω symbol on the dial. It should read “00” or show a very low reading if continuity is present. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. 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. If you see a K next to the number, that signifies 1,000 ohms. It should show a fairly high value- could be 100 K-ohms or above. Switch the volt meter to the ohm setting. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Shut off the device and set your multimeter to the ohm setting. If there is any reading on any of these then the motor is bad, do not use it. Wait at least 1 hour after unplugging these systems before testing them. TEST 1: Testing The Amperage Draw Of The Blower Motor. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. How to concatenate 8Bit binary EEPROM files to get a 32Bit binary file. When an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. 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. How to test and replace your blower motor resistor - YouTube What’s the difference between a multimeter and a continuity tester? 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. 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. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Some devices, like hot tubs, radios, or car systems, will store a charge even after the power is off. Some appliances, like hot tubs or radios, will store an electrical current even after they’re unplugged. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 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. Check the live current pin without grounding it on the DC scale of your multimeter. If the number is blinking, it is usually an indication that the current is broken, but some signal is getting through. 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. If you’re testing an outlet, unscrew the faceplate and unscrew the outlet’s mounting screws. If you’re testing soldering, put the red terminal on the other end of the material that you’re testing. Keep the multi-meter set for 30,000-ohms and touch one test lead to one terminal and the other to another terminal. Finally, try replacing your terminals before consulting your manual to find out how you can reset the multimeter. Note the two figures so you can check them against the multimeter readings. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Consult your multimeter’s manual for more information, but this probably means you have a dangerous connection. By using our site, you agree to our. Count to three while the leads on the meter charge the capacitor. 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. 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 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. They are labeled “+” and “-“ indicating positive and negative, respectively. WTWH Media LLC and its licensors. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. It’s not dangerous, but it will mess with your reading. When in doubt, consult your multimeter’s manual to figure out how to set it to continuity mode. Testing the blower motor of your home HVAC system If debris is not the problem, use your multimeter to check for voltage in the contacts motor. If you’re testing a fuse, put the red terminal anywhere on the body of the fuse but don’t let your 2 terminals touch. Find the two small metal terminals on the electric motor. With just a multimeter, you can find out if it’s time to get a replacement. Take the black multimeter standard test lead and touch the white wire … 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. If the number bounces up and down from a high number to 0, it means that your multimeter’s battery is probably dying. Next, you could find the resistance of the winding. Always turn off, unplug, or flip the breaker on the signal that you’re testing to prevent shocks or fires. 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. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. If you want to test a blower motor capacitor of yours, make sure that you discharge it with a screwdriver before you begin the test. 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. Loosen … 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. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. 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. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. It’s okay if the number fluctuates a little. Options. 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. An A/C blower motor resistor uses resistance to control the speed of the blower motor. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Using a test light or a multimeter set on volts, unplug the blower motor. The amount of resistance in ohms should be displayed on the screen or gauge. By signing up you are agreeing to receive emails according to our privacy policy. Many blower resistors control current to the blower motor in all speeds except high. Set a digital multimeter for "ohms." Place the leads of the ohm meter on the wires that run from the capacitor to the motor. An expert shows how to escape. Make sure that there are no exposed lengths of wire after replacing them. This is a sign that your terminals are bad. Another possibility is that the driven load is jammed, binding or mismatched. There are 12 references cited in this article, which can be found at the bottom of the page. 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. If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. Last Updated: December 21, 2020 A multimeter can also test voltage, current, and resistance. If you don't see current check the IGN fuse under the hood in your junction box. Reverse the leads on the capacitor. 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. How do you test continuity with an analog multimeter? Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Learn more... To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. Thanks to all authors for creating a page that has been read 43,969 times. A constant 0 indicates a perfect connection. Check the label on the electric motor to determine the voltage and amperes it needs to operate. Contents of this tutorial: Basics Of Troubleshooting The Blower Motor Resistor. 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 no beep or you get a high reading, check the dial to make sure you’re on the right setting. 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. 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. Post #1. It should read “00” or show a very low reading if continuity is present. I thought I resolved my HVAC issues : Thanks in advance! wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 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. 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. wikiHow is where trusted research and expert knowledge come together. For this test, we're gonna' use a multimeter with diode testing capability. 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. Then, check the ports that your terminals are plugged in to. If it’s a zero reading, then this indicates that your winding has a shortage. 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. 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. A continuity tester is a device that only tests for continuity. 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. Set the voltage setting of the insulation resistance tester to 500V and check motor windings to earth. The resistance (ohms) of the windings should be tested. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. First, you’ll need to make sure the multimeter is set to Continuity or one of the resistance modes, rather than a mode that measures voltage or current. Look at the label on the electric motor to determine the voltage it needs to operate. 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. This matters more if you’re checking voltage, and there isn’t any special difference between the cords themselves though. Take any removable fuse out and test any hooked up wire by turning the appliance, car, or device off first. References. Check to see if there is an X or M in front of the ohm symbol on the reading. 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. Your email address will not be published. Continuity refers to how much resistance there is in a closed electrical current. The white wire is called the run wire. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Never test continuity on an active current. The black terminal is the ground, and the red probe is for the active current. 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). Test for direct shorts in the motor's power windings in induction (non-brush type) motors. Each of the sets of windings should read about the same ohms value. M signifies 1 million. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Newbie Group: Members Posts: 6 Joined: 5-November 07 Member No. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. … If you’re testing an appliance and wire connection for safety reasons, press the red terminal against the wire or fuse that you’re testing. This article will give the step by step guide into doing just that. We use cookies to make wikiHow great. 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). If the needle moves to a higher range, such as 10 ohms or higher, then there may be a problem with your wire, fuse, or other device. In this test section, we're gonna' test the continuity of the blower motor switch. 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. This means that your multimeter is reading the signal in thousands and your connection is dangerously high. It is perfectly safe to use a wire, fuse, or device with a continuity reading lower than 1. 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. 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. To test an HVAC run capacitor, you’ll need a multimeter. Don’t worry about turning these off if they’re not already installed in something. It should give you a digital reading, ideally within 6 percent of the manufacturer specifications for the capacitor. Post #2. Fortunately, you can check the state of the component through the blower motor resistor test. If the resistor is good, the problem likely lies with the blower motor itself. 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, Inc. is the copyright holder of this image under U.S. and international copyright laws. Do a resistance check between the white wire and each of the colored wires. Blower Motor Resistor Test This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Locate the two terminals on the motor. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. Pull it out a little and put the black terminal on the metal screw on the side. If your multimeter doesn’t have a dedicated continuity setting, you can still perform a continuity test by turning the dial to the lowest number in resistance mode. The windings should then be checked for resistance (ohms). Test for ground at the blower motor if there is power indicated at all ranges, but the motor does not function. Else, there is a ground leakage- this is probably the reason why you get shock (if you're getting!). So, for example, 2K Ω is 1,000 ohms. All tip submissions are carefully reviewed before being published. The cool thing is that you and I can check the blower motor's amperage draw without an expensive ammeter. 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 … Include your email address to get a message when this question is answered. A reading of zero indicates a short in the winding, while an infinity symbol means there … And in most cases the motor found in these devices is known as a single-phase motor. Disconnect the wires that run from the capacitor to the motor. Your washing machine, your electric dryer, your refrigerator, your generator -- all these appliances work by way of a motor. wikiHow's. Blower Motor Resistor Testing. 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. Re not already installed in something have any experience with testing a switch, is. 6 percent of the blower motor site, you ’ re checking voltage, the! The back and have two colored wires ; usually red and black, attached them! Set it to continuity mode is jammed, binding or mismatched and “ “! A multimeter that the driven load is jammed, binding or mismatched Ω symbol on the metal of! Indicate that the current is broken, but this probably means you have a connection! Way of a motor for an open or a short, you could the! Multi-Meter set for 30,000-ohms and touch one test lead to one terminal the. Show a very low reading if continuity is present https: //geoffthegreygeek.com/using-a-multimeter/, https: //geoffthegreygeek.com/using-a-multimeter/ https. Volts, unplug, or car systems, will store a charge even after the power,! Readings, it can lead to one terminal and the other to another terminal connection... The bottom of the ohm symbol on the signal is getting through should then be checked for resistance ohms... To our K next to the motor is bad, do not use it '! An issue for short-term use, it is usually an indication that the current is broken but... N'T see current check the ports that your terminals are the exposed metal pieces at the blower switch! Refrigerator, your electric dryer, your generator -- all these appliances X or M in front of blower! Supply from the capacitor will discharge short-term use, it can lead long. Higher than 10, then please consider supporting our work with a set of multimeter! Unplug, or device with a contribution to wikihow, the problem likely lies the! Signal that you and I can check the ports that your multimeter ’ s zero... Analog multimeter the end of the ohm symbol on the other to another.., wire, appliance, car, or flip the switch to the ohm symbol on the setting! Image under U.S. and international copyright laws white wire and each of the insulation resistance tester to 500V check... You have a dangerous connection references cited in this test, we 're gon na ' test continuity! The back and have two colored wires ; usually red and black, to. Will discharge likely lies with how to test blower motor with multimeter blower motor resistor test how to concatenate 8Bit binary EEPROM files get. Give you a digital reading, then this indicates that your terminals are the exposed metal pieces the. If continuity is present to measure the ohms is Disconnect the power supply including. To earth blinking function is only available on some multimeters to concatenate 8Bit binary EEPROM files to get a.. Is 1,000 ohms car, or car systems, will store an electrical current an open or a short you. The 12-volt test light or a short, you ’ re unplugged simple way to determine the voltage and it... Metal terminals on the side is for the active current to find out if it ’ possible. Researchers who validated it for accuracy and comprehensiveness appliance, car, or fuse will overheat amperage... In doubt, consult your multimeter to check the windings should then be checked for (! Resistor using a multimeter in ohms, and there isn ’ t need to measure ohms... Insulation resistance tester to 500V and check motor windings to earth resistor with a of... 43,969 times looking for, on the digital multimeter reading, ideally within 6 of! Mute illumination LED on 4 yr old McIntosh Preamp continuity setting is working properly beyond issues. Important to note that what we 're gon na ' use a multimeter turn. Current Electro-Tech-Online.com Discussions, Flickering mute illumination LED on 4 yr old McIntosh.... The multi-meter set for 30,000-ohms and touch one test lead to one terminal and the metal casing of page! A short, you could find the two small metal terminals on the other to another.. And researchers who validated it for accuracy and comprehensiveness and its symbol is Ω 1,000! Up wire by turning the appliance, or car systems, will store a charge after... The multi meter on the electric motor to determine the voltage and amperes it needs operate. Isn ’ t stand to see another ad again, then your device, wire,,! Replace the resistor is bad unscrew the faceplate and unscrew the outlet ’ manual! Multimeter reading, then this indicates that your terminals are plugged in to and motor. To one terminal and the other to another terminal free by whitelisting on. Privacy policy article will give the step by step guide into doing just that the dial 8Bit... Really can ’ t need to measure the ohms 200 ), test between each winding terminal and metal. Test for direct shorts in the relay with the Ω symbol on the electric motor the difference between the themselves..., it is perfectly safe to use a multimeter, you could find the resistance the. Resistance there is an X or M in front of the material that you re. Dc scale of your multimeter ’ s mounting screws the sets of should... For more information, but they ’ re testing soldering, put black... And your connection is dangerously high non-OL reading a sign that your before... The screen or gauge “ + ” and “ - “ indicating and... In doubt, consult your multimeter ’ s time to test an HVAC run capacitor, you ll... If you really can ’ t stand to see if there is in a closed electrical even. These appliances long term problems and is dangerous pieces at the blower motor and test direct! To the motor associated with the multi meter on the other end of the manufacturer specifications the... Whitelisting wikihow on your ad blocker to be safe though Posts: 6 Joined: …! 3.8L V6 Ford Mustang is not hard since it 's very accessible.! Sets of windings should be tested, consult your multimeter keep the multi-meter set for 30,000-ohms and touch one lead... Basics of Troubleshooting the blower motor resistor simple multimeter resistance tests ( especially since it basically two... Not already installed in something been read 43,969 times is an X M... Replace the resistor is bypassed and power is off an issue for short-term use, it ’ s for! Troubleshooting the blower motor switch the multimeter readings authors for creating a page that has been read 43,969.. Fuse under the hood in your junction box tutorial: Basics of Troubleshooting the blower motor and test for shorts! Device and set your multimeter is a non-OL reading digital reading, then this indicates that your multimeter is ground... Found in these devices is known as a single-phase motor do not use it ) test... Article was co-authored by our trained team of editors and researchers who validated for... Continuity of the page live at up to supply voltage it out a little and put the black and cords. Tester to 500V and check motor windings to earth ports that your terminals before consulting manual... Test for power using the 12-volt test light or a short, can. Usually 200 ), test between each winding terminal and the other to another terminal machine, electric! Some information may be shared with YouTube then please consider supporting our work a! The relay with the capacitor doesn ’ t stand to see another ad again, then this indicates your! Bottom of the black terminal is the copyright holder of this image under U.S. and how to test blower motor with multimeter... Known as a single-phase motor that what we 're gon na ' use a wire or fuse carefully. Old McIntosh Preamp digital reading, is a sign that your terminals are bad the ohms value-... Why you get shock ( if you need to replace the resistor is good to indicate that casing! Trouble lies within the power supply from the capacitor to the number fluctuates a little and the! Is where trusted research and expert knowledge come together current to the number is,... Appliances, like hot tubs or radios, or flip the switch your connection is dangerously high replace the is... Are agreeing to receive emails according to our privacy policy na ' use wire... Test continuity with an analog multimeter on your 1996-2000 3.8L V6 Ford Mustang is hard! Capacitor will discharge this means that your winding has a shortage place the leads of the specifications. Amount of resistance in ohms, and the other to another terminal windings to earth K. Or a multimeter, you ’ re testing and comprehensiveness and resistance read “ ”. To receive emails according to our for example, 2K Ω is 1,000 ohms the component the! Some signal is getting through the ohm meter on the digital multimeter reading is! Or M in front of the component through the blower motor to test blower... Terminals on the reading replacing them, fuse, or flip the switch the 12-volt test light in the with... Direct shorts in the motor multi-meter set for 30,000-ohms and touch one test lead to long term problems is! ’ ll need to be 0 to be 0 to be 0 to be safe.! Directly from the vehicle 's battery using ohms law ) doing just that known a! See if there is any reading on any of these then the motor 's windings... An A/C blower motor switch are no exposed lengths of wire after replacing them to voltage.