Listen for a click when the relay is energized. Check the switched-on state of the relay contacts. Use a digital multimeter (DMM) to test the resistance between each pole of the relay and the appropriate NC and NO contacts for that pole. All NC contacts should show infinite resistance at the corresponding pole.
How can you tell if a relay is defective?
You want to feel and hear every click. If you feel and hear clicking noises, the relay is working on one side – the side with the circuit and coil. However, if there is no horn beep, then the relay has a problem in the contact circuit.
How do you use a multimeter to tell if a relay is defective?
Take a multimeter and set it to ohms. Touch the wires across the solenoid coil pins and measure the resistance. Anywhere from 50120 ohms is OK. Out of range or open means bad solenoid winding and time for a new relay.
How do I check if a relay is defective?
The only tool needed to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set for DC and the switch in the cab on, first check for 12 volts at position 85 in the fuse box where the relay is plugged in (or wherever the relay is located
How do I test a relay with a multimeter?
Take a multimeter and set it to ohms. Touch the wires across the solenoid coil pins and measure the resistance. Anywhere from 50120 ohms is OK. Out of range or open means bad solenoid winding and time for a new relay
