Hi Folks. I just wanted to let you know how this story ended. After finding that every fuse checked out fine, I got the truck transported to a professional auto shop. I needed some other stuff done anyway. They changed the batteries and found out that the starter was gone. It was bad in the first place, so that was ok. Then the truck started up just fine. They told me I was lucky, because the computer could have been melted just as well. Anyway, I picked up the truck yesterday and it rides like a dream
Guess I won't be jump starting with 24 volt again anytime soon - maybe more like
never again!
Thanks all.