Testing the defrost components
Get an ohm meter or get a flash light and run 2 wires out of it so when you touch the wires together the light will come on(poormans meter) Then you should be able to check each component for continuity. You can get an old lamp cord and put aligator clips on the heater and briefly power it up to see if it comes on. The terminator needs to be placed into a freezer for 2 hours and then it should have continuity. When it warms up it opens and shuts down that heater so you won't melt the ice box.
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