If anyone has an idea about the lights, a fuse or circuit breaker or fuse link to go to that would be great.
The tire I think just needs to be replaced, it looks old and hard. I think the rears are already in the wide position if they have one but since you mentioned it Roy I was looking at the pictures and it looks like the fronts can be swapped for a wider track, am I correct?.
You can check the fuses and such. I hope that's all it is. All the other electrics work (gages, etc)?
Right off the bat, I strongly suggest you buy the Service Manual!! You're going to need it, I think. And, get the Deere manual....those aftermarket manuals suck. I hope the Operator's Manual came with tractor. That's still on the Deere website (not downloadable, but you can read it). Here's a
link to it.
You did check all the hydraulics, PTO operation and such, right? You can get by without lights, but not the loader or PTO.
As far as the rear tire, "Old and hard" doesn't necessarily mean bad. Tractor tires have pretty stiff sidewalls, so you may be mistaking that for something else. Tires aren't cheap, by any means.
As far as swapping the fronts, there's controversy about that. The front axle does pivot at the centerline, so you won't see much improvement in stability. I did swap my fronts on my old 790 and there seemed to be an improvement...but that might have been more psychological then any thing else.
BTW, you wrote the rears were already as wide as they can go...it doesn't look like that in the first pictures you posted. It looks like those tires are still pretty close to the fenders (you should have 3.5 to 4 inches between the sidewall and fender...looks like you have an inch).
As far as the armor kit there should be a shield at the quick disconnects and another one, IIRC. Seems to me there was a skid pan too (under the engine).
Anyway, get the manuals (read the online manual while you're waiting), change all the fluids and filters.