HELP - I figure I have to replace the block heater plug end, am I able to do this myself or need a real mechanic? One side of plug is now loose, burnt and burning the ends of (5) extension cords used. I live in WI and it's cold, I need to plug in my trucks. These were my husbands trucks(2005 & 2006 duallys) and he passed away 1 month ago now I have to get it done myself and yes they are for sale soon too- just in case you were wondering. Thank you in advance.