I have a Cat 257b 2007. Ran the machine for 2 hours today and came in for dinner. Went back to move it and when you turn the key to the first position where all the light come on there is nothing coming on. Nothing at all is happening when you turn the key. Just as if the battery is all the way dead. Battery is showing 12.8 volts. Horn will blow load. Toke panel down to check key switch and have power going through the switch. Not the switch. Disconnect safety switch from lap bar and check good. Not lap bar switch. I'm lost. Is there any other safety switch that I'm missing or something else? Thanks, Tony