Whadaya know. I was just using a defrost timer a couple days ago.
Generally, the unit plugs in with a four conducter socket that is not
reversable. So, you just out with the old, and in with the new. Nearly fool
You've got four pins on the timer. My cheat sheet is out in the truck.
But..... the one pin that is separate from the others is the ground for the
motor. The center of the "group of three" is the center pole of the single
pole double throw switch. The other two (outside of the group of three) are
Power for the motor comes probably from the center pole (continuous run).
Might come off one of the other poles if it's a cumulative run.
Christopher A. Young
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