Thanks Jim,
Really helpful. I think it is probably wise to replace both fuses with new 35 amp fuses as the existing ones are both quite tired looking and corroded, and clean up the terminals in the fuse box as they are also quite oxidised to ensure the best connection possible.
Good to know which circuit does what as well. I have a separate modification for an electric cooling fan for the radiator which runs on a separate in line circuit protected by a blade fuse. Must check what amperage fuse that is, as i would like to carry a spare onboard in the event of a problem whilst out and about.
