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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