First thought (and easiest) from your description sounds like the ignition key switch might be suspect. Though glancing at the schematic there are a few things it could be.
That manual will be pretty handy for tracing through once you get that. They did a good job in the electrical section of the JD tech manual for 425/445/455
Dave
That manual will be pretty handy for tracing through once you get that. They did a good job in the electrical section of the JD tech manual for 425/445/455
Dave