YaleTech. , Thanks for the information. We did what you suggested and called the local Yale dealer. He was very good with these trucks. I asked questions , watched and learned a lot. I ordered a service manual also. All of our other trucks are Toyota and Raymond electrics and are not like these trucks in any way. We got those new and I had a chance work with the dealer techs while they were on warranty. These came from a plant that closed and had a few thousand hours on them. It's going to take a while learn them. Thank you everybody who commented, everything helps. Lee