![]() The goal is to determine if the blower motor is getting power and ground. In this example I’ll use a two-wire connector for a blower motor. How to use a multimeter to read power and ground an polarity If you see -12, the black lead is connected to battery voltage. If the red lead is connected to battery voltage the meter will read +12. If you’re not sure which of two wires in a connector is battery voltage, set the meter to 20-DCV and connect the red and black leads to the two wires. Multimeter setup for polarity testing (bottom row middle and right image in above photo) Plug the red lead into the VΩmA port and the black lead into the common (COM) port. When auto computers go into sleep mode they usually draw less than 50-mA, so set your meter to the 200DCA setting. Multimeter setup for milliamps (mA) (bottom row left image in above photo) ![]() More on how to connect the leads in series shown below. However, if you’re using your meter to test less than 10-amps, set the meter to the 10A setting and move the red lead to the 10ADC port. When testing high draw accessories like blower motors, wiper motors, seat heaters and rear window defoggers, professional use an inductive clamp because their meters simply can’t handle those higher current draws. ![]() If the component draws more than that, you will blow the internal fuse in your meter. Most multimeters are limited to reading a maximum of 10-amps. That’s because auto electrical accessories you might want to current test will usually draw more than 10-amps. There are very few instances for using this setting in auto diagnostic work. ![]() Multimeter setup for 10 or less amps (top row right image in above photo) Multimeter setup for Ohms (Ω) resistance (top row middle image in above photo)Īutomotive resistance for sensor is often fairly low so it’s usually best to start testing with your meter at the lowest Ω setting. Since auto voltage is usually below 15.5 volts, set the meter dial to the 20 DCV setting. ![]() Multimeter setup for volts and polarity (top row left image in above photo)Īutomotive voltage testing is usually done with the meter set to DC volts or DCV. ![]()
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