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Joe, if a new starter switch didnt help, IF ITS NOT AN INTERNAL STARTER PROBLEM (worn brushes or armature etc) and assuming you have a good battery cable to it, a good battery and connections and a good ground, the copper post that comes out through the starter that the switch makes contact with may be bad or burned or pitted or worn down excessively. You have to be sure theres no mechanical or linkage restrictions preventign the switch from engaging fully n deep enough. If the starter post is bad, you may be able to file n wire brush it down smooth and cure the problem temporarily, but if its just worn down too low, it needs to be replaced. If when trying to start the tractor the lights would dim way down and/or the battery voltage drop drastically, the switch and starter post is likely okay, but the starter may have an internal short or a shorted armature. If the switch n starter post arent making good electrical contact, then the starter isnt being electrically connected so it could draw heavy current to dim the lights. HOWEVER, even if the switch n post are okay and the armatures not shorted, if the brushes are worn too low or not being held down tight against the commutator by the hold down springs, she still wont start but that scenario wouldnt draw the battery voltage down too bad. Make sure the battery is good n charged and to be safe, remove, clean n wire brush, n reattach all the battery n starter n ground connections. Good Luck n God Bless John T
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