Beneath the terminal cover is found the compressor relay (labeled "A" below), overload protector (labeled "B") and the electrical terminals of the compressor motor.
Remove the compressor relay by pulling it straight off from the compressor.
Pull the wire off of the side terminal of the relay. It is connected with a slip on connector. Firmly pull the connector, do not pull on the wire. You may need to use a pair of needle-nose pliers.
Inspect the connector and terminal for corrosion. If either is corroded they should be cleaned or replaced.
There are two types of relays you may encounter, wire coil and solid state. If the relay has an exposed wound wire coil it can be tested for continuity. Otherwise, the relay is of solid state design and requires specialized equipment for testing.