In Reply to: Selinoid just clicks posted by John on April 03, 2019 at 14:58:12:
A common and often overlooked problem is corrosion where the battery ground cable connects to the frame. Did you clean that? Are your cables in good conditon.
Also, where is the ground cable attached to the frame? If it is still connected to the framework around the battery holder, get a longer ground cable and run it to the tractor body as close to the starter as possible. I have my side mount 8n grounded to one of the steering system bolts to rear of starter.
The battery support has several bolt connections it needs to go through to get to the main frame. Each connection is a potential for corrosion and high resistance.