At idle or low RPMs it will charge but if i turn on the PTO or headlights it discharges. Also if I raise RPMs without turning anything on it does not charge. The battery is new. I just received this tractor it has been sitting in the woods for a few years. It starts right up and it has a Kawasaki FC540V engine.
Tractor is a 257-H
Since my original post . The charging system came to life on its own .It is now charging above 17 amps .I replaced the key switch ,removed cleaned the rectifier plug and base . cleaned the ground terminals . I am still trying to find out how many years this tractor sat out in the woods. When I have time I will test the rectifier with the chart Garry posted.
Thank you everyone. I will post the results sometime next week.