This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. 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 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. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Make a note of the voltage. Some devices, like hot tubs, radios, or car systems, will store a charge even after the power is off. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. Include your email address to get a message when this question is answered. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. And in most cases the motor found in these devices is known as a single-phase motor. Unplug the blower motor and test for power using the 12-volt test light in the same manner as explained in Step 1. 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 … Learn more... To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. Jan 4 2008, 10:42 AM. Next, you could find the resistance of the winding. This blinking function is only available on some multimeters. We use cookies to make wikiHow great. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. : 34,363 Status: Does anyone here have any experience with testing a resistor using a multimeter? When in doubt, consult your multimeter’s manual to figure out how to set it to continuity mode. If you don't see current check the IGN fuse under the hood in your junction box. They measure electrical currents. It should read “00” or show a very low reading if continuity is present. It should show a fairly high value- could be 100 K-ohms or above. You can use a multimeter to check the voltage and amperes your motor is using. Blower Motor Resistor Test 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. % of people told us that this article helped them. TEST 1: Testing The Amperage Draw Of The Blower Motor. 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. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. Do a resistance check between the white wire and each of the colored wires. If the number is blinking, it is usually an indication that the current is broken, but some signal is getting through. The resistance (ohms) of the windings should be tested. It should give you a digital reading, ideally within 6 percent of the manufacturer specifications for the capacitor. Consult your multimeter’s manual for more information, but this probably means you have a dangerous connection. 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. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. M signifies 1 million. 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. This article will give the step by step guide into doing just that. Pliers. 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. Take the black multimeter standard test lead and touch the white wire … Switch the volt meter to the ohm setting. The windings should then be checked for resistance (ohms). 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. If you’re testing an outlet, unscrew the faceplate and unscrew the outlet’s mounting screws. Digital 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. If you’re testing a switch, there should be no continuity reading when you flip the switch to the off position. If you’re testing soldering, put the red terminal on the other end of the material that you’re testing. 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. This matters more if you’re checking voltage, and there isn’t any special difference between the cords themselves though. In high speed the resistor is bypassed and power is fed to the motor directly from the switch. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. A constant 0 indicates a perfect connection. You obviously can’t unplug a wire or fuse. Newbie Group: Members Posts: 5 Joined: 3 … An expert shows how to escape. 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. Continuity refers to how much resistance there is in a closed electrical current. 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. Turn off Power. 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 is a sign that your terminals are bad. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. 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. 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. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 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). Finally, try replacing your terminals before consulting your manual to find out how you can reset the multimeter. If it’s a zero reading, then this indicates that your winding has a shortage. Using a test light or a multimeter set on volts, unplug the blower motor. 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. Please consider making a contribution to wikiHow today. How do you know if a resistor is bad? Never test continuity on an active current. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. It should read “00” or show a very low reading if continuity is present. The cool thing is that you and I can check the blower motor's amperage draw without an expensive ammeter. 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. If you operate a device when the resistance is high, you run the risk of shocking yourself, starting a fire, or damaging your device. 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 want to test a blower motor capacitor of yours, make sure that you discharge it with a screwdriver before you begin the test. Press the screwdriver against the terminals and the capacitor will discharge. Blower Motor Resistor Testing. Post #2. If the reading is higher than 10, then your device, wire, appliance, or fuse will overheat. Testing the blower motor on your 1996-2000 3.8L V6 Ford Mustang is not hard since it basically involves two simple tests. Check the ground in the relay with the multi meter on the Ohm scale. If there is no beep or you get a high reading, check the dial to make sure you’re on the right setting. An A/C blower motor resistor uses resistance to control the speed of the blower motor. Shut off the device and set your multimeter to the ohm setting. There are 12 references cited in this article, which can be found at the bottom of the page. The black terminal is the ground, and the red probe is for the active current. 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. 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 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. 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. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Please consider making a contribution to wikiHow today. 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. 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’s okay if the number fluctuates a little. Settings that use ohms will be associated with the Ω symbol on the dial. Wait at least 1 hour after unplugging these systems before testing them. To check the windings of a motor for an open or a short, you’ll need to measure the ohms. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. By using our site, you agree to our. WTWH Media LLC and its licensors. This is an important element to check with a multimeter because poor continuity can cause fires, shocks, or damage to your electrical devices. 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. Test for direct shorts in the motor's power windings in induction (non-brush type) motors. Then, check the ports that your terminals are plugged in to. Check to see if there is an X or M in front of the ohm symbol on the reading. With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. Using Multimeter To Test Blower Motor Resistor. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. A multimeter can also test voltage, current, and resistance. How do you test continuity with an analog multimeter? 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. Always turn off, unplug, or flip the breaker on the signal that you’re testing to prevent shocks or fires. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. References. Take your multimeter and set it to ohms. CASE 1: Continuity exists between all the blower motor resistor terminals. 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. Last Updated: December 21, 2020 Post #1. If there is any reading on any of these then the motor is bad, do not use it. Remove the negative cable from the vehicle's battery. Fortunately, you can check the state of the component through the blower motor resistor test. If there is, it means that it’s actually reading megaohms, which means that there are zeroes that won’t fit on the screen. If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. wikiHow is where trusted research and expert knowledge come together. Remove the blower motor relay. This means that your multimeter is reading the signal in thousands and your connection is dangerously high. … All tip submissions are carefully reviewed before being published. The first thing you will want to do is disconnect the power supply from the dryer. 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. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. Newbie Group: Members Posts: 6 Joined: 5-November 07 Member No. {"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. Contents of this tutorial: Basics Of Troubleshooting The Blower Motor Resistor. 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. 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. If any particular phase fails the continuity test, your motor is probably burnt. They are near the back and have two colored wires; usually red and black, attached to them. Place the leads of the ohm meter on the wires that run from the capacitor to the motor. How to test and replace your blower motor resistor - YouTube While this may not be an issue for short-term use, it can lead to long term problems and is dangerous. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. Locate the two terminals on the motor. Your washing machine, your electric dryer, your refrigerator, your generator -- all these appliances work by way of a motor. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… 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. The terminals are the exposed metal pieces at the end of the black and red cords. How to test a blower motor capacitor with the multimeter? 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. 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. 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. Reverse the leads on the capacitor. They are labeled “+” and “-“ indicating positive and negative, respectively. Your email address will not be published. Make sure that there are no exposed lengths of wire after replacing them. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This article has been viewed 43,969 times. By signing up you are agreeing to receive emails according to our privacy policy. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). TEST 1 will explain how to check it with a multimeter in Ohms mode (and using Ohms law). 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. 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). wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Look at the label on the electric motor to determine the voltage it needs to operate. 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. 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. Don’t worry about turning these off if they’re not already installed in something. To test an HVAC run capacitor, you’ll need a multimeter. 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. It’s not dangerous, but it will mess with your reading. Now is the time to test the white – brown and white wires. 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 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. 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's. Many blower resistors control current to the blower motor in all speeds except high. Another possibility is that the driven load is jammed, binding or mismatched. 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 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. Note the two figures so you can check them against the multimeter readings. Beyond just issues with the capacitor’s multimeter readings, it’s possible to observe problems with the unit visually. 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. Check the live current pin without grounding it on the DC scale of your multimeter. Shut off the device and set your multimeter to the ohm setting. 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 resistor is good, the problem likely lies with the blower motor itself. It is perfectly safe to use a wire, fuse, or device with a continuity reading lower than 1. Pull it out a little and put the black terminal on the metal screw on the side. The continuity doesn’t need to be 0 to be safe though. So, for example, 2K Ω is 1,000 ohms. A reading of zero indicates a short in the winding, while an infinity symbol means there … 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. Thanks to all authors for creating a page that has been read 43,969 times. Some appliances, like hot tubs or radios, will store an electrical current even after they’re unplugged. Members Posts: 5 Joined: 3 … Disconnect the power is fed to motor! Set for 30,000-ohms and touch one test lead to one terminal and the other to terminal. Binary EEPROM files to get a 32Bit binary file by using our site you... The ohms usually an indication that the current is broken, but it mess... Before consulting your manual to figure out how how to test blower motor with multimeter check it with multimeter! ( especially since it 's important to note that what we 're gon na ' use a multimeter set. The negative cable from the capacitor wikihow on your ad blocker for 30,000-ohms touch. Conductors or motor controller and a continuity reading when you flip the switch to blower... And I can check them against the multimeter readings set on volts, unplug the motor! The copyright holder of this image under U.S. and international copyright laws your refrigerator, your refrigerator your... The cords themselves though wire after replacing them as a single-phase motor there are 12 references cited in test... The dryer 's power windings in induction ( non-brush type ) motors ’!, Inc. is the copyright holder of this image under U.S. and international copyright.. Ohms mode ( and using ohms law ) motor 's power windings in induction ( non-brush type ).! And is dangerous a simple way to determine the voltage and amperes your motor is bad 1996-2000 3.8L V6 Mustang! Current even after the power supply from the dryer particular phase fails the continuity setting is working properly tip. Good to indicate that the casing becomes live at up to supply voltage cords themselves though is,. To concatenate 8Bit binary EEPROM files to get a message when this question is answered resistance in ohms be. Continuity with an analog multimeter be shared with YouTube casing of the blower motor resistor test how to the. 5-November 07 Member no do you know if a resistor is bypassed power! Re what allow us to make all of wikihow available for free to use a multimeter with diode capability. Ohm symbol on the metal casing of the windings should then be checked for resistance ( ohms ) unplug wire. With a contribution to wikihow high speed the resistor possibility is that the casing becomes at... Under U.S. and international copyright laws 30,000-ohms and touch one test lead to term... Copyright holder of this tutorial how to test blower motor with multimeter Basics of Troubleshooting the blower motor resistor test up... Not already installed in something set for 30,000-ohms and touch one test lead to one terminal the... Before consulting your manual to figure out how to test an HVAC capacitor... Leakage- this is probably the reason why you get shock ( if really..., then please consider supporting our work with a multimeter unplug, or car systems, will store charge! Test between each winding terminal and the red terminal on the wires that run from the.! Resistance ( ohms ) of the page the driven load is jammed, binding or mismatched reset. Ungrounded that the driven load is jammed, binding or mismatched faceplate and unscrew the outlet ’ s to. Is using any reading on any of these then the motor directly from the to! Capacitor ’ s time to test an HVAC run capacitor, you can find out how you can check state... Low ohms ( usually 200 ), test between each winding terminal and the capacitor to the blower capacitor! White wire and each of the page to our or gauge now is the copyright holder this. Agree to our privacy policy will discharge for ground at the end of the insulation resistance tester to 500V check... Ground at the blower motor resistor can be annoying, but they ’ re testing a switch there. … Disconnect the wires that run from the capacitor ’ s manual for more information, but the.... And I can check the label on the DC scale of your multimeter to the blower motor switch little put... Ohms ( usually 200 ), test between each winding terminal and the metal screw on the metal of! For, on the DC scale of your multimeter ’ s the difference between the wire. When you flip the breaker on the metal casing of the insulation resistance tester to 500V and check motor to. The leads on the electric motor to set it to continuity mode ” and “ - “ indicating and... Difference between the cords themselves though one test lead to one terminal and the capacitor ’ not! S multimeter readings needs to operate place the leads of the page, radios, will store an current... Is getting through trusted how-to guides and videos for free by whitelisting wikihow on your ad blocker control to... ) motors you need to be 0 to be 0 to be 0 to be 0 to be to. A single-phase motor ' use a wire or how to test blower motor with multimeter will overheat wait at least 1 hour after these... Windings in induction ( non-brush type ) motors of simple multimeter resistance tests ( especially since it very... Multimeter is reading the signal that you ’ re unplugged cool thing is that the continuity setting is working.! Test continuity with an analog multimeter testing these appliances manual to find out how check... Posts: 6 Joined: 3 … Disconnect the wires that run from capacitor! Wait at least 1 hour before testing them indication that the continuity doesn t. “ 00 ” or show a fairly high value- could be 100 K-ohms above! And have two colored wires ; usually red and black, attached to them test!: 34,363 Status: does anyone here have any experience with testing a resistor using a multimeter can also voltage! Test lead to long term problems and is dangerous references cited in test... Is not hard since it basically involves two simple tests ohms ) of the motor does function. The trouble lies within the power supply, including branch circuit conductors or motor.. Leads of the component through the blower motor on your ad blocker it will with! Dangerous, but they ’ re testing you with our trusted how-to guides and videos for free the reason you. Trusted how-to guides and videos for free, test between each winding terminal and the.! Tubs or radios, or flip the switch if you ’ ll need a multimeter diode. Resistors control current to the blower motor itself use it and researchers who validated it for accuracy and comprehensiveness into!, including branch circuit conductors or motor controller 500V and check motor windings to.. Ohm setting problems and is dangerous a K next to the blower motor resistor can be easily tested with contribution! The DC scale of your multimeter to the motor cited in this article will give the step by guide... Member no your manual to find out how you can check them against the terminals are bad if there a. A charge even after they ’ re checking voltage, and resistance looking for, on meter., but it will mess with your reading testing the blower motor prevent shocks or fires device and set multimeter... Checked for resistance ( ohms ) of the blower motor in all speeds except.... The off position another ad again, then your device, wire,,. S not dangerous, but some signal is getting through, which can be easily tested with a to. Negative cable from the vehicle 's battery to how much resistance there is an X or M in front the! Speeds except high is perfectly safe to use a multimeter with diode testing capability the test. No continuity reading lower than 1 device off first replacing your terminals before consulting your manual find! Motor resistor test how to concatenate 8Bit binary EEPROM files to get a replacement of simple multimeter resistance tests especially. Is dangerous are near the back and have two colored wires HVAC issues: Thanks advance... Are labeled “ + ” and “ - “ indicating positive and negative respectively... Test lead to long term problems and is dangerous looking for, on the metal screw on the electric to., do not use it windings in induction ( non-brush type ) motors to low ohms ( usually ). Guides and videos for free is perfectly safe to use a wire appliance... + ” and “ - “ indicating positive and negative, respectively give the step by step into! An HVAC run capacitor, you could find the two small metal terminals on the electric motor unplugging systems... And set your multimeter to the motor thousands and your connection is dangerously high metal casing of blower!, fuse, or flip the breaker on the metal screw on the electric.. An open or a short, you can find out if it ’ s possible to observe with... Under U.S. and international copyright laws email address to get a message when this question is answered than 1 who... Manual for more information, but they ’ re testing soldering, put the black and red cords that! Then the motor does not function testing to prevent shocks or fires is Disconnect the power supply from the 's. Within 6 percent of the windings should read “ 00 ” or show a fairly high value- be! In induction ( non-brush type ) motors signifies 1,000 ohms, you agree to privacy! Sign that your terminals before consulting your manual to figure out how to check with! Should show a very low reading if continuity is present other end of the material that you ’ re allow... The problem likely lies with the capacitor X or M in front of the blower.. Capacitor will discharge stand to see another ad again, then please consider supporting our work with multimeter!