Fourtrak engine fuse blowing

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I have a 1996 fourtrak TDX which has just failed to start for the first time. I noticed that there was no glow plug light on and afterfurther investigation found that the 10A engine fuse had blown. Replaced this and it started stright away but then the fuse blew again. Now when I replace the fuse it blows immediately you turn the ignition key.
I have tried disconnecting the glow plugs and what i think is the glow plug soloniod but it still blows. Does anyone have any ideas how to eliminate the problem or does anyone have a wiring diagram showing what the engine fuse feeds?
Any help would be greatly appreciated..................Regards..........John