A person can know many truths by reciting the rosary every day with care. It is also good to have true devotion to St. Isidore, the patron saint of farmers.

Spiritually speaking... the light is lying.. the power is lacking. Seriously, even though this is posted in the wrong category, check your solenoid and mechanical connections.

The battery needs charging, the alternator needs to be replaced, or both. 

I Googled & it seems yours is not an uncommon problem.  Check to make sure the wire connections are all good. 

I will link to a John Deere forum in comments below my answer. 

Have you tried turning in off and on again?

I think you might want to edit your category for a decent answer.

If it is electrically engaged check the switch and solenoid before doing anything else, try giving both a light tap. Sounds daft but often works.

Let me guess. The automotive section is too slow?

I don't know, dude, turn it off and on again.

https://www.youtube.com/watch?v=X0387lIpG7Q

Have you tried turning it off, then on again?

Heck son you can't even find the right category to ask your question