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Only going by the wiring on my carbie but, the main 30A fuse (the one in the fuse box) supplies the next 4 or 5 fuses below it in the box via the ignition relay which is operated by the key switch. (The charging circuit is protected by the big separate fuse and this plus the alternator and reulator cct are all upstream from the 30A fuse in the box so wouldn't seem to be involved). All the sub ccts eg, all various lights, horn, ignition system etc are sub fused after the ignition relay so you would expect that any fault or overload on these ccts would blow their individual fuse. The fact that the fuse is blowing after 30mins would suggest that it is either running at or just over full load causing it to blow gradually or an intermittent short circuit and very possibly the supply to/from the ignition switch in the loom where it meets the front forks/yolks?? Possibly the cutting out could be related to loom damage round that area??
Phil
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