Product review (4 stars): Instructions are totally stupid
The product works.  The instructions are insane.  I'm an electrical engineer and the instructions make no sense at all.
I called Whirlpool, they say if you can't read the instructions then you should call a technician.
The problem is, they have created a "universal" timer to use in "many" applications.
The instructions appear to address four different applications of the timer.

Continuous application means => the timer runs 24x7. => uses terminal 1;  will defrost every 6 hours.
Cumulative application manes =>  the timer only runs when the compressor is running.  uses terminal 2; will defrost whenever the compressor has accumulated 6 hours of run time.

Protruding from the side of the timer body is a black wire.  This is NOT a ground wire.  It supplies power to the actual timer by connecting to either terminal 1 or terminal 2.  Apparently, you are supposed to jam this jumper wire into the top of the four pin connector after you plug the connector into the timer.  (see photo).  I elected to use terminal 2 and make it a continuous application.

The part works, but the instructions are stupid.  A photo included in the instructions would make much more sense than the schematic diagram.