How To Test A Power Resistor

How to use an ohm meter. Turn the multimeter dial to the resistance setting.

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Discharge any capacitors in the circuit by touching the leads of a spare high wattage resistor to the leads.

How to test a power resistor. Before you can test a resistor you need to know its strength and tolerance. Prepare a digital multimeter dmm to measure the resistor. How to test vehicle acheat blower motor.

Power off the circuit containing the resistor you wish to measure. When your blower motor goes bad you will not get ac or heat to blow inside of your vehicle you will also not be able to defrost your windows. When an electrical current passes through a resistor due to the presence of a voltage across it electrical energy is lost by the resistor in the form of heat and the greater this current flow the hotter the resistor will get.

Never measure a resistor in a circuit with a live current running through it. This is known as the resistor power rating. A faulty resistor loses power at different positions on the switch.

How to use a multimeter to check a resistor. Testing a resistor with an ohmmeter is the best easiest and most effective way to tell whether a resistor is good or not. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

Test for power at all the blower speeds by moving the blower speed switch through all positions. If there is no power indicated on high blower speed the problem is most likely the switch or the fuse. Automotive electrical diagnosis tutorial.

If you look at a resistor one end should have a gold silver or white band. Place one lead of the ohmmeter on terminal 1 of the resistor. How to test resistors steps remove power from the circuit containing the resistor.

How to check resistance using a digital multimeter. Isolate the resistor from the circuit. The orientation doesnt matter because resistance isnt polarized.

How to check resistors with meter how to test value of carbon color resistors voltmeter multimeter measure a bad resistor in a tv power supply color code for resistor colour bands are at. High blower speed has direct power to the motor from the switch. To set up for the check we take the ohmmeter and place its probes across the leads of the resistor.

Determine the actual. Place the other lead on terminal 2 and check against specifications. Read the resistor value visually.

Test a resistor with an ohmmeter. If this circuit is open showing infinity on the ohmmeter the blower resistor must be replaced. Turn the resistor so that this band is to your right.

How to test a resistor.