Slightly off topic. Not until recently (after 38 years!) I managed to acquire the appropiate wiring diagram for my model, a CB500K2 (ED). That model also has three fuses. A bit strange Honda named it UK-European type. To my knowledge none were imported in the UK. Anyway, for who's interested, pic below. If you need a higher resolution, I've sent Bryan one. Peculiar to see the ultrashort O/W and LB/W wires, going... nowhere. Like wisdom teeth. On the US CB550 models these wires materialised to feed the running light filaments in the duplo lamp equipped indicators.