Dear friends, beginner here!!
I have small equipment with Arduino Uno, which has 2 coolers inside. It is important for me to be sure that these coolers are always working, so, I decided to install a ACS712 to monitor the electrical current permanently.
I have no space to put 2 sensors (one for each cooler), so I wonder if I can put only one sensor, and connect both grounding wires of both coolers on the same INPUT of this sensor.
If one cooler stops, the electrical current would drop, so I would know something happened.
What say you?? 
Thank you very much!