This article is a snapshot of how to test resistance with relays to determine activity when troubleshooting units.
1. Keep the unit powered on, and adjust the multimeter to the ohm gear.
2. Connect the red and black probes to the output terminal of the relay at random, and observe the resistance on the multimeter;
3. If the resistance value changes and is normal, it means that the output terminals are connected well and the relay is normal; If the resistance value is infinite, it means that the coil is an open circuit and the relay is damaged; If the resistance value does not change, it means the output terminals are not connected and the relay is damaged.
Coil rated voltage 12VDC, DC resistance 120 Ω± 10%