This was originally posted in the 60 section but they recommended I also post here. I inherited a 1987 HJ60 (diesel, 5-spd) and need advice. It was my dad's truck and it means a lot to keep it on the road. My dad had driven it every couple of weeks around the farm and had just put in 2 new matching batteries before he passed. About a month had gone by before I got to it and found the lights had been left on so it wouldn't start. I had it towed to a garage and asked them to charge the batteries, at the same time I told them it was a 24-volt diesel. They called me a couple of days later and said it was arcing when they tried to connect the batteries and I needed to come get it. They claimed they didn't know it was 24-volt. I had it towed to another garage to have the electrical looked at since I didn't know what damage may have happened at the first shop. They are going to look at it but currently have it up on a rack until their electrical guy comes back in a couple of weeks. My questions are what are possible causes of what happened and what do you think might be causing it to still not start?