[header] How to test a refrigerator ptc relay [title] Expose the back of the fridge to get access to the motor. [step] Make sure the appliance is unplugged. [title] Find the fridge compressor and remove the plastic case that houses the starting circuitry. 
[step] Either memorize the wiring or take a few pictures just to be sure you know how to put it all back together when you're done. There's usually a diagram somewhere as well-make sure you can follow it and identify parts.