Thanks everyone. I'll do some testing on the current setup this weekend. It may just be a bad connection. One thing that I question is why have a 15 amp stator with only a 10 amp regulator/rectifier? Especially on a tractor with electric lift?
Simplicity Did the same kind of thing, offered electric lift as add on if you wanted it in 7000 and 7100 series. They did have a 22 nf battery standard. I have electric lift and use it for snow plow and tiller. I think you will be all right for an hour or so of use.