Hello Dan, I would bet money it is your cables or conections. I can't remember if a 400 has a soleniod or a push button but the connection at the end of the battery cable is where the tractor gets all of it power. check that connection with a volt meter for power. also check the cable where it bolts to the battery box. A farmer fix would be to hold the key in the start position and wiggle the cables if you get a spark or it starts that is where your problem is. I don't think you can hurt anything hooking the battery up backwards If there was when you were hooking up the cables it would be like an arc welder. maybe it would blow the diode in the alt. but it would still run. Good Luck Ed
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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