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How to Find out what is grounding out my tractor?

I have a JD Sabre 15.5 38 Hydro, the tractor was running fine before now it blows the fuse when you turn the key on. I have traced the line all the way to the starter or the alternator, I am not sure where the short is. The alternator when a ohm meter is applied it comes out as an open circuit across the red and black I am not sure if this is how it is supposed to be or if there is supposed to be a resistance or not open at all. please advise
Scott, April 2010
If it blows the fuse as soon as you turn the key i do not think it is a alternator problem, it is more likley to be an ignition switch problem.

Husqvarna man, April 2010