[Billy-O]

I'm casting doubt that the engine ACR is your issue base on your description of click and then start. I could be wrong, but I suggest you go back over the connections and make sure it's all bright, clean and tight....especially that of the battery, solenoid and starter. I also would make sure the ground is great especially to the motor and not just the tractor frame wherever that ground cable connects. Sometime the battery cables can go bad at the eyelets and cable.

Now, if you think ACR is the issue, I would assume the engine would just turn over slowly and then stop rather than get the click you described.