L2550 Won't crank

[a3matrix]

So, I was doing some brush work today and managed to stall the tractor, possibly at the woods mower, but didn't shear the bolt. When going to start now I get all the lights, I can preheat the glow plugs, but when I turn to start I get a click and nothing else. I have the tractor in neutral, PTO disengaged, clutch depressed. Had no trouble all day until this happened. It was the end of the day and rather than let fatigue and irritation get in the way I towed it back to the barn (B5200 to the rescue) and intend to go over it tomorrow. It strikes me like maybe safety switch or something just not letting it crank.
Any insights greatly appreciated. Thanks in advance.

 

[Tx Jim]

Check all FOUR battery cable connections to be sure they're clean & tight.

 

[rentthis]

After checking the battery connections, all the safety switches is a good place to start. If it's HST, check to see if the forward reverse pedal is centered.

 

[a3matrix]

Problem solved itself, until next time. I went out this morning, made sure all shift levers were set to neutral, PTO disengaged, hi-lo selector set and hit the key and it started.
For future reference. Can anyone tell me where the safety switches are? I would love to do a visual inspection on all those.
Thanks