This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. To test an HVAC run capacitor, you’ll need a multimeter. Jan 4 2008, 10:42 AM. If the resistor is good, the problem likely lies with the blower motor itself. 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. Check the live current pin without grounding it on the DC scale of your multimeter. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. In this HVACR Video we go over the Troubleshooting of the ECM 3.0 Variable Speed Blower Motor and Testing with and without the TecMate Pro. This 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. Keep the multi-meter set for 30,000-ohms and touch one test lead to one terminal and the other to another terminal. If there is any reading on any of these then the motor is bad, do not use it. 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 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. This is an important element to check with a multimeter because poor continuity can cause fires, shocks, or damage to your electrical devices. Continuity refers to how much resistance there is in a closed electrical current. This matters more if you’re checking voltage, and there isn’t any special difference between the cords themselves though. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Post #2. If debris is not the issue, it’s time to get out the multimeter and check for AC voltage across the motor’s contacts. TEST 1 will explain how to check it with a multimeter in Ohms mode (and using Ohms law). Options. Don’t worry about turning these off if they’re not already installed in something. You can use a multimeter to check the voltage and amperes your motor is using. 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). Never test continuity on an active current. If the reading is higher than 10, then your device, wire, appliance, or fuse will overheat. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Disconnect the wires that run from the capacitor to the motor. All tip submissions are carefully reviewed before being published. There are 12 references cited in this article, which can be found at the bottom of the page. Blower Motor Resistor Test For this test, we're gonna' use a multimeter with diode testing capability. When in doubt, consult your multimeter’s manual to figure out how to set it to continuity mode. You obviously can’t unplug a wire or fuse. The windings should then be checked for resistance (ohms). Remove the negative cable from the vehicle's battery. How do you test continuity with an analog multimeter? Blower Motor Resistor Testing. 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. 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 is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. How to test a blower motor capacitor with the multimeter? M signifies 1 million. Current Electro-Tech-Online.com Discussions, Flickering mute illumination LED on 4 yr old McIntosh Preamp. If the number is blinking, it is usually an indication that the current is broken, but some signal is getting through. 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. If it’s a zero reading, then this indicates that your winding has a shortage. Then, check the ports that your terminals are plugged in to. In this test section we're going to test the diode that's in the blower motor power transistor. It is perfectly safe to use a wire, fuse, or device with a continuity reading lower than 1. If you’re testing soldering, put the red terminal on the other end of the material that you’re testing. Take the black multimeter standard test lead and touch the white wire … 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.

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