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It looks like the doghead mod was never done. I think it is not as important when the vehicle is converted to 12 volt, but don't believe me without checking with others. I saved this pic from another poster because it is very good.
That said, I don't think that is your problem. My M1008 is...
Get a battery heater pad. It will give the battery the power it needs for cold starts or I should say make it easier to use the battery power stored. I live in Montana and this is all I need during the coldest winters...