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JD 400 won't crank

Barry Klapperich Lawn tractor was working fine. Mowed with it one day and the next day it turned over twice and then nothing. It won't crank. I have the service manual and have performed all of the tests for the cranking system. All check ok until I get to the "Key Switch" test. When I check for voltage while cranking the key to start, it reads 4.75-5.25 volts at the red wire on the rear of the key switch. Subsquently, all the saftey switches have the same voltage until it reaches the solenoid, which also has a voltage reading of 4.75-5.25 volts. The purple wire at the top of the key switch has 12.50 volt reading. According to the diagnosis I replaced the ignition switch only to find the exact same results. I also tried a new solenoid because I had no voltage from the starter side cable of the solenoid. Does anyone have any suggestions? I appreciate and advise in advance.

Thanks,
Barry

John Heine Battery have a bad ground?Reads 12 volts then when you try to crank have voltage drop.


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