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On a related note, core plug heaters can need maintenance on their cords, on both ends. In the past I have had to shine the tarnish off the contacts on each end of the cord with steel wool; on the engine side I used di-electric grease to keep from having to crawl under there again for that and on the plug-in end I use a bit of WD-40 but one could easily get away with using nothing because access is easy and the steel wool bit takes only seconds.
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