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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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