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In Reply to: Jinma not cranking posted by Mike on Sunday, January 29, 2006:
I don't have a tractor and I was looking into one when i came across you posting. I work for Caterpillar as a starter and charging system Tech. There are several things that come to mind with your problem. First the three components that make up you starting an charging system.
Alternator- i have no idea what alternator they are using but i have recently evaluated some alternators out of china. Some have a high leakage current, Leakage current is the amount of current that the machine or individual components will draw from the battery while its just sitting. However, even the worst one's will take a week or two to drain your battery, if the battery is good. That is also if the alternator is good, if the resistor that handles the leakage into the field is shorted it will also shorten the time it takes to kill the batteries.
Batteries- If the batteries have an internal short they will not hold a charge. Or put out enough current to start the tractor.
Starter- However it sounds like you have a possible short in the starter because of the blown fuse while cranking. If the starter has an internal short it will drain the batteries while sitting and cause excessive current draw during the cranking cycle, which could blow the fuse.
Lastly- You might also have a short in the wireing of the tractor which could cause these problems.
I would just start with the easiest and work from there, first i would look over all the wireing to make sure there was not rub through on the any wire and that all the conectors were tight and free of corrosion. Second i would check to make sure the battery was good. easiest way would be to take it in an have it checked at autozone for free. Same for the alternator and starter(they check car alt's and starters but don't know about tractor).
You could check some of the components yourself but you need a good volt meter and some knowlege.
Good luck, finding electrical problems can be difficult.