Old, use a large needle and poke through the insulation to do an ohm check. Good idea to unplug it first. There is also a temperature switch in line with the heating element, make sure it is good.
Plug back in and rotate the defrost timer until the compressor turns off, then use a voltage tester that chirps when it gets near a power wire. That should tell you if power is getting to the heating element. Could tell you where you have lost power too. I like to use amprobe to look at the compressor current and heating element current.
Coils will ice up, defroster has to melt it. Good luck. Ever get all your chargers charging? George
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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