New Holland TL100a electrical issues

[VanAernemB]

I have a new holland TL100a that is going crazy. the 4wd is going in and out. The AC shut off and when I turn on the radio it is not working also if the tractor is in 2wd it will put it in 4wd???? I can shut it off then it is fine when I restart. sometime it will be a week before it happens again and others it goes crazy on the next run.

 

[i7win7]

I would check/clean ground cable at battery & frame. Cab should also have some type of ground connection.