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If it is heating without being turned on but not heating all the way, there is probably a short in the wiring. From the wiring you are able to see, is the insulation starting to crumble? I suspect it will require rewiring and possibly a new selector switch for the large oven. I have restored many electric ranges from the 40's and 50's but it is very time consuming and expensive. An average rebuild on a range runs about $1000 or more, depending on the condition of the porcelain and chrome.