Years ago i had a friends dodge truck that would not turn over at all when the temp drop to -40 , even being boosted with two cars at once. Ended up taking the battery inside, putting it in the kitchen sink with hot water around it while we charged it. Then put a colemen tent heater in place of the battery, and a 2 burner coleman stove under the oil pan for and hour with a heavy moving blanket over the hood and sides. It started right up frist try after..
