Charging Issues
 

Is this ok for my Cub Cadet 108.. it has a brand new USA Made VR new wiring harness. New/Used SG from a working and charging machine.

https://streamable.com/ei73jk

I have 2 brand new VR and both does this. One is from ccspecialties and other from Ebay.. the ccspecialties one is unknown brand and Ebay one is made in USA. I know the Cub will stay running even with the battery disconnected so i know its charging.. But I do not want to boil my new battery.

It is ok...

Well its boiling by battery. so its going full send on the SG.. i'm Thinking the Yellow Field Wire might have a ground short. because thats the only reason i could think it going crazy.

Check that you have the labeled terminals on the regulator connected to the proper places they need to be.
It is common for regulators that the terminals are in different places/location.:bigthink:

I'm leery of any new voltage regulators you can purchase today..... But.... What ol'george said AND make sure you have good ground to the VR.