Don't know about those block heaters, but I've bought several of the orange-ish silicone pad heaters that go on oil pans, and I keep having a problem with the wire insulation cracking when it gets cold. The insulation apparently cannot handle temps below -25F very well, and we hit those temps often. Finally got to where I would clip off all but 6" of the cord, then splice in a cheap winter-grade (usually blue) extension cord while making sure any of the original cord insulation is well-covered in electrical tape. Seems to hold up well now.
I don't know if these heaters have a specific polarity or not, but I always take great care to ensure the wires don't get connected wrong. Don't think insurance would like it much if a heater pad caught fire because of my mistake! :shock:
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Today's Featured Article - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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