Thanks for all the good advice, all fixed and working now! Only issues were blown fuse and just 1/2 hr. Ago found some light corrosion on the steer encoder cable plug. Got some contact cleaner and brush on that and the beast rolls where I steer it now, and all checks out. I was able to do the learn steer because the wonderful previous owners never changed either password, 1 for operator and 2 for superword. The regrettable thing was the first day I worked on it, I unplugged and checked a lot of plugs including that one, saw a tiny bit of white powder at base of one prong, and ignored it, but that was the one.