[pogobill]

I believe the solenoid grounds from the 4th terminal, not through the body of the unit, as was mentioned earlier.

 

[pogobill]

Do you have a manual for your tractor? Here's an owners manual.
https://c.searspartsdirect.com/mmh/lis_pdf/OWNM/L0807733.pdf

You really need to go back and review all of the information that has been given to date. I'm sure if you do, and follow the advise given by the members, you will be successful in getting your tractor in running order. There are not a whole lot of parts between the key and the engine, and pretty much everything has already been covered, and your questions have been answered. In the mean time, you seem to refuse to either follow all of the steps in the advise that is given, or refuse to answer simple questions like "Did you get a new battery"! You said your old battery failed the load test at the shop, so unless you have replaced the unit, you are still going to have trouble. When you turn the key and hear the repeated clicking sound, it could be a good indication the that battery does not have enough power to start the tractor.... as mentioned above.