Most likely you have a shorted glow plug. First unplug all 8 leads and energize the start cycle which activates the timer box. If you blow a fuse now its the timer box thats shorted.
Then connect 1 or 2 leads at a time until you blow the fuse. You can unplug 1 of the last 2 to isolate the bad glowplug. Using the wire leads will keep you from having to remove every glowplug from the heads.
Check your ground wires to the timer box because the timer only cycles for the initial start. Also as the weather gets colder the timer can work longer but not indefinitely. That can be another reason for the fuse to blow.
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