How To Test A Relay With A Multimeter
In the case of a light bulb) or take it to be repaired.
How to test a relay with a multimeter. If the multimeter has multiple ranges within the ohm setting, choose the lowest range possible to get the most accurate reading. Dmms and analog ohmmeters are available in electronic parts and hobby stores. You will find the resistance of the relay coil.
Testing the normally open (no) terminal of the relay. (resistance mode) (common for all type) at first, set the mode of multimeter to the resistor mode. One probe should connect to the pin that goes to the fuel pump, and the other should connect to the pin that goes to the battery.
Note the readings on the multimeter screen. Confirm the integrity of the relay load connections. The multimeter acts as if it was a cord in your circuit.
Grab a multimeter and set it to ohms. The black multimeter probe of the multimeter should be connected to the circuit of the ignition switch, while the red probe should connect to the red battery cable. Look for the setting on your multimeter that has the ohm symbol (ω) to use for testing your relay.
Make certain a) all power to the circuit is off and b) no voltage exists at the diode. Use a digital multimeter (dmm) or analog ohmmeter to measure the resistance across the load connections of the relay. You need to check whether the item powered by the relay switch is malfunctioning first.
Then connect the red and black probe of the multimeter to the coil of the relay: Here the resistance of the nc and no contacts must be adequate. Put the multimeter in the ohmmeter setting;
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