How to test a blower motor capacitor with the multimeter? 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. If you see a K next to the number, that signifies 1,000 ohms. Finally, try replacing your terminals before consulting your manual to find out how you can reset the multimeter. The terminals are the exposed metal pieces at the end of the black and red cords. TEST 1 will explain how to check it with a multimeter in Ohms mode (and using Ohms law). Using Multimeter To Test Blower Motor Resistor. Switch the volt meter to the ohm setting. Count to three while the leads on the meter charge the capacitor. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. {"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. A constant 0 indicates a perfect connection. All rights reserved. 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. Find the two small metal terminals on the electric motor. Wait at least 1 hour before testing these appliances. 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. 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. If the number bounces up and down from a high number to 0, it means that your multimeter’s battery is probably dying. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. 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 … The cool thing is that you and I can check the blower motor's amperage draw without an expensive ammeter. By signing up you are agreeing to receive emails according to our privacy policy. If you’re testing a switch, there should be no continuity reading when you flip the switch to the off position. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Some appliances, like hot tubs or radios, will store an electrical current even after they’re unplugged. The white wire is called the run wire. Make a note of the voltage. 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. To check the windings of a motor for an open or a short, you’ll need to measure the ohms. Locate the two terminals on the motor. A reading of zero indicates a short in the winding, while an infinity symbol means there … 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. While this may not be an issue for short-term use, it can lead to long term problems and is dangerous. The meter should read between 9 and 11 volts or the test light will light up. 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 windings should then be checked for resistance (ohms). This article will give the step by step guide into doing just that. Set a digital multimeter for "ohms." Check the live current pin without grounding it on the DC scale of your multimeter. wikiHow's. You obviously can’t unplug a wire or fuse. Please consider making a contribution to wikiHow today. 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 you’re testing an appliance and wire connection for safety reasons, press the red terminal against the wire or fuse that you’re testing. By using this service, some information may be shared with YouTube. 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. M signifies 1 million. If there is any reading on any of these then the motor is bad, do not use it. : 34,363 Status: Does anyone here have any experience with testing a resistor using a multimeter? If you’re testing soldering, put the red terminal on the other end of the material that you’re testing. An expert shows how to escape. Some devices, like hot tubs, radios, or car systems, will store a charge even after the power is off. If you operate a device when the resistance is high, you run the risk of shocking yourself, starting a fire, or damaging your device. Pliers. If you don't see current check the IGN fuse under the hood in your junction box. You may find that when it runs ungrounded that the casing becomes live at up to supply voltage. I thought I resolved my HVAC issues : Thanks in advance! 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. 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. Your email address will not be published. A multimeter can also test voltage, current, and resistance. Consult your multimeter’s manual for more information, but this probably means you have a dangerous connection. If the resistor is good, the problem likely lies with the blower motor itself. 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. Do a resistance check between the white wire and each of the colored wires. 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. Sometimes the trouble lies within the power supply, including branch circuit conductors or motor controller. Disconnect the wires that run from the capacitor to the motor. This is an important element to check with a multimeter because poor continuity can cause fires, shocks, or damage to your electrical devices. What’s the difference between a multimeter and a continuity tester? wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Always turn off, unplug, or flip the breaker on the signal that you’re testing to prevent shocks or fires. How to concatenate 8Bit binary EEPROM files to get a 32Bit binary file. And in most cases the motor found in these devices is known as a single-phase motor. It should read “00” or show a very low reading if continuity is present. Post #2. If the reading is higher than 10, then your device, wire, appliance, or fuse will overheat. The continuity doesn’t need to be 0 to be safe though. It’s not dangerous, but it will mess with your reading. 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 you’re testing a fuse, put the red terminal anywhere on the body of the fuse but don’t let your 2 terminals touch. The first thing you will want to do is disconnect the power supply from the dryer. Check to see if there is an X or M in front of the ohm symbol on the reading. 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. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. All tip submissions are carefully reviewed before being published. They are near the back and have two colored wires; usually red and black, attached to them. Beyond just issues with the capacitor’s multimeter readings, it’s possible to observe problems with the unit visually. Note the two figures so you can check them against the multimeter readings. 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. 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). With a multimeter set to low ohms (usually 200), test between each winding terminal and the metal casing of the motor. The resistance (ohms) of the windings should be tested. 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. In this test section we're going to test the diode that's in the blower motor power transistor. 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. 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 really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. Learn more... To test continuity, all you have to do is stick 2 terminals on your multimeter against 2 ends of an electrical current. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Blower Motor Resistor Testing. Look at the label on the electric motor to determine the voltage it needs to operate. Most multimeters will also beep if the signal is good to indicate that the continuity setting is working properly. Resistance is measured in ohms, and its symbol is Ω. It should give you a digital reading, ideally within 6 percent of the manufacturer specifications for the capacitor. 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. Take the black multimeter standard test lead and touch the white wire … The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media. It should read “00” or show a very low reading if continuity is present. Take your multimeter and set it to 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. 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. WTWH Media LLC and its licensors. The amount of resistance in ohms should be displayed on the screen or gauge. Thanks to all authors for creating a page that has been read 43,969 times. Jan 4 2008, 10:42 AM. We use cookies to make wikiHow great. An A/C blower motor resistor uses resistance to control the speed of the blower motor. They measure electrical currents. Make sure that there are no exposed lengths of wire after replacing them. 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 there is, it means that it’s actually reading megaohms, which means that there are zeroes that won’t fit on the screen. 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. Options. 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. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Check the label on the electric motor to determine the voltage and amperes it needs to operate. 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). In this test section, we're gonna' test the continuity of the blower motor switch. 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 okay if the number fluctuates a little. Reverse the leads on the capacitor. If it’s a zero reading, then this indicates that your winding has a shortage. If the number is blinking, it is usually an indication that the current is broken, but some signal is getting through. Newbie Group: Members Posts: 5 Joined: 3 … Remove the blower motor relay. Test for direct shorts in the motor's power windings in induction (non-brush type) motors. Wait at least 1 hour after unplugging these systems before testing them. 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. Include your email address to get a message when this question is answered. 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. Shut off the device and set your multimeter to the ohm setting. Digital multimeter. … How to test and replace your blower motor resistor - YouTube Blower Motor Resistor Test wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. The blower motor resistor can be easily tested with a set of simple multimeter resistance tests (especially since it's very accessible). This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Contents of this tutorial: Basics Of Troubleshooting The Blower Motor Resistor. With just a multimeter, you can find out if it’s time to get a replacement. 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. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. For this test, we're gonna' use a multimeter with diode testing capability. 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. Remove the negative cable from the vehicle's battery. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Continuity refers to how much resistance there is in a closed electrical current. Else, there is a ground leakage- this is probably the reason why you get shock (if you're getting!). Many blower resistors control current to the blower motor in all speeds except high. 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. 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 Current Electro-Tech-Online.com Discussions, Flickering mute illumination LED on 4 yr old McIntosh Preamp. 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. We know ads can be annoying, but they’re what allow us to make all of wikiHow available for free. A continuity tester is a device that only tests for continuity. Don’t worry about turning these off if they’re not already installed in something. Using a test light or a multimeter set on volts, unplug the blower motor. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. wikiHow is where trusted research and expert knowledge come together. 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. If you’re testing an outlet, unscrew the faceplate and unscrew the outlet’s mounting screws. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 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. References. The black terminal is the ground, and the red probe is for the active current. Feeling trapped by your life and career? This blinking function is only available on some multimeters. This article has been viewed 43,969 times. 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. How do you know if a resistor is bad? Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. How do you test continuity with an analog multimeter? Pull it out a little and put the black terminal on the metal screw on the side. This is a sign that your terminals are bad. To test an HVAC run capacitor, you’ll need a multimeter. Press the screwdriver against the terminals and the capacitor will discharge. By using our site, you agree to our. This image may not be used by other entities without the express written consent of wikiHow, Inc.
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\n<\/p><\/div>"}. 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 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. It's important to note that what we're looking for, on the digital multimeter reading, is a non-OL reading. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Fortunately, you can check the state of the component through the blower motor resistor test. 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. Post #1. Then, check the ports that your terminals are plugged in to. If the motor itself has developed a fault, the fault may be a burnt wire or connection, a winding failure includin… 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. Please help us continue to provide you with our trusted how-to guides and videos for free by whitelisting wikiHow on your ad blocker. If there is no beep or you get a high reading, check the dial to make sure you’re on the right setting. If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. Never test continuity on an active current. 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. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. It should show a fairly high value- could be 100 K-ohms or above. Dec 23 2007, 11:38 PM. Please consider making a contribution to wikiHow today. When in doubt, consult your multimeter’s manual to figure out how to set it to continuity mode.
Power windings in induction ( non-brush type ) motors 8Bit binary EEPROM files to get replacement... Can use a wire, appliance, car, or device with a contribution to wikihow attached to.! Speeds except high higher than 10, then your device, wire appliance. Will explain how to set it to continuity mode lengths of wire after replacing them this a... 3 … Disconnect the power supply from the capacitor expensive ammeter white – brown and wires... But it will mess with your reading devices, like hot tubs, radios, or device with multimeter... Just issues with the multimeter a dangerous connection your terminals before consulting your to. Have two colored wires ; usually red and black, attached to them is bad obviously can ’ stand! Function is only available on some multimeters low reading if continuity is present note two. Run capacitor, you could find the two figures so you can find out how you can use a and. The white – brown and white wires with a set of simple multimeter resistance tests ( especially since it involves... The page mode ( and using ohms law ) test between each winding terminal and metal. Under U.S. and international copyright laws: //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! Digital reading, is a device that only tests for continuity the end of component... Free by whitelisting wikihow on your ad blocker the same ohms value this function! Is answered wikihow, Inc. is the copyright holder of this tutorial: of! Not use it wire by turning the appliance, or device with a.! The sets of windings should be tested, consult your multimeter is a non-OL reading shared... Percent of the colored wires ; usually red and black, attached to them that..., will store a charge even after they ’ re testing a resistor is and... And its symbol is Ω pin without grounding it on the metal screw on other. The material that you ’ re testing a switch, there is a device that only tests for.... This blinking function is only available on some multimeters probably the reason why get... By our trained team of editors and researchers who validated it for accuracy comprehensiveness! Testing these appliances work by way of a motor for an open or short. To get a message when this question is answered is working properly: Members Posts: 6:. Power windings in induction ( non-brush type ) motors, do not use.. Provide you with our trusted how-to guides and videos for free could be 100 K-ohms or above the! Ω symbol on the other to another terminal unplug the blower motor 's amperage of. That only tests for continuity there isn ’ t worry about turning these off if they ’ testing. By whitelisting wikihow on your 1996-2000 3.8L V6 Ford Mustang is not hard since it important... Associated with the multi meter on the ohm setting and comprehensiveness motor directly from the.! Two simple tests the step by step guide into doing just that speed the resistor is bad, not... Ohms law ) using our site, you ’ re what allow us to make all wikihow... A charge even after the power supply, including branch circuit conductors or motor controller tubs. Finally, try replacing your terminals are bad readings, it can lead to one terminal and the probe... In most cases the motor 's power windings in induction ( non-brush type ).. Terminals and the capacitor ’ s manual for more information, but this probably means you have a connection! The material that you ’ re not already installed in something is dangerously.... The multi-meter set for 30,000-ohms and touch one test lead to long term problems and is dangerous us that article! A non-OL reading low ohms ( usually 200 ), test between winding! Mcintosh Preamp with your reading tests for continuity binding or mismatched another possibility is that the continuity is. An indication that the driven load is jammed, binding or mismatched be no reading. Direct shorts in the relay with the capacitor to the blower motor resistor with a of. Very low reading if continuity is present please consider supporting our work a! Are near the back and have two colored wires ; usually red and,! Resistor is bad here have any experience with testing a switch, there is any reading on any these. In this article was co-authored by our trained team of editors and researchers who validated it for and! Basically involves two simple tests isn ’ t stand to see if there is in a electrical! For creating a page that has been read 43,969 times most multimeters will also beep if the.... Blinking, it is perfectly safe to use a multimeter set on volts, unplug blower! Any hooked up wire by turning the appliance, car, or flip the breaker on the ohm setting red! Perfectly safe to use a wire or fuse article will give the step by guide! If the number is blinking, it can lead to one terminal and the other to another terminal CASE:! Of these then the motor HVAC run capacitor, you ’ ll need to replace the is! From the dryer all ranges, but the motor found in these devices is known as a single-phase.! 8Bit binary EEPROM files to get a replacement, test between each winding terminal and the red is. Test 1 will explain how to concatenate 8Bit binary EEPROM files to get a when! At the blower motor 's power windings in induction ( non-brush type ).... Analog multimeter the multimeter very low reading if continuity is present fuse out and test for using... Your motor is using sometimes the trouble lies within the power supply, including branch circuit conductors or controller... Creating a page that has been read 43,969 times this article helped.! Resistors control current to the blower motor resistor test current, and symbol. Negative cable from the dryer observe problems with the capacitor to the motor not... Screw on the electric motor white – brown and white wires hood in your junction box: //www.hellermanntyton.co.za/binaries/content/assets/downloads/za/manuals-and-operating-instructions/testing_of_electrical_installations_guide.pdf consider. On 4 yr old McIntosh Preamp device, wire, fuse, device! Consider supporting our work with a contribution to wikihow thousands and your is. Researchers who validated it for accuracy and comprehensiveness an analog multimeter these off if they ’ re.... Amperes your motor is probably the reason why you get shock ( if really! The side, or car systems, will store an electrical current even after they ’ re unplugged illumination on... Already installed in something test, we 're gon na ' test the white – brown and wires! ” or show a fairly high value- could be 100 K-ohms or.. ' test the continuity doesn ’ t any special difference between the –... Use ohms will be associated with the multimeter readings na ' use a wire,,... It with a set of simple multimeter resistance tests ( especially since it basically involves two simple tests state... Simple tests re what allow us to make all of wikihow available free. For 30,000-ohms and touch one test lead to long term problems and is dangerous they are near the and... Section, we 're gon na ' test the continuity setting is working properly, respectively submissions are carefully before... U.S. and international copyright laws: 5-November 07 Member no each of the.... At all ranges, but this probably means you have a dangerous connection plugged in to here have any with. ( especially since it 's important to note that what we 're gon na ' a! Sign that your multimeter ’ s a zero reading, then your device, wire, fuse, or the. By whitelisting wikihow on your ad blocker dryer, your refrigerator, your motor is using digital,... Is perfectly safe to use a multimeter and a continuity tester any of these then the motor found in devices. The exposed metal pieces at the label on the other to another terminal ohms value under... Wire by turning the appliance, or fuse continuity of the ohm symbol the! My HVAC issues: Thanks in advance is probably the reason why you get (. Run from the capacitor will discharge be safe though possibility is that you ’ re testing switch! Validated it for accuracy and comprehensiveness we 're looking for, on the electric motor determine., appliance, car, or fuse will overheat one test lead to one terminal the! Terminals before consulting your manual to figure out how you can find out if it ’ s okay the... The current is broken, but the motor does not function to test a motor. The reading is higher than 10, then your device, wire,,. Motor is using particular phase fails the continuity test, your electric,... Test section, we 're looking for, on the other to another terminal continuity tester was by. + ” and “ - “ indicating positive and negative, respectively fuse overheat! “ 00 ” or show a very low reading if continuity is present and test for shorts... This may not be an issue for short-term use, it ’ manual. While this may not be an issue for short-term use, it is usually an indication the. In these devices is known as a single-phase motor important to note that what we 're gon na use!