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Well, you can keep replacing parts one by one & pretty soon it will either start or you will have a new tractor! :) The trick to fixing these tractors (or trouble shooting any piece of equipment) is to be systematic about it. You need to isolate the problem step by step and work from most likely to least likely. Jumping ahead to 'my buddy said it could be whatever' usually just wastes your time and your money. Otherwise, you are going to end up chasing your tail around that tractor & spending a boatload of money to fix what could easily be a loose wire or dirty grounds. I offer this advice from personal experience because I am not a mechanic. I do not have the ability learned after 30 years of working on an N tractor to simply diagnose the problem & go right to the fix. Assuming you have a good starter (and chances are very good that you do) the current has to flow from the battery to the starter & back to the battery. (so to speak). So, at some point, the current stops. Your job is to find where it stops. Lets start w/ the battery. Is it fully charged? A battery is checked w/ a load tester (big $$$$)or a hydrometer ($3) Get a hydrometer. Next, and the most likely cause of "dead silence" when you press the starter button, is dirty grounds at the solenoid, on the battery posts or between the starter & the block, or worn/corroded cables. And, of all the parts you have replaced, the most likely to fail (and the least expensive), given the symptoms you describe, are the battery cables. Make sure you use the braided strap for the positive cable & a large 1/0 gauge for the negative post going to the starter. If you have a fully charged battery, good cables & grounds & it still does not start, check out tip # 43, at the link below, for a tip on safely jumping it w/ a 12v battery. Post back & let us know what worked.
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