They are the services powered from the ignition switch apart from the ignition itself.
Best guess is that it is to prevent the engine stopping due to a fault in one of these (sort of) unessential services.
But I am at a loss to know why there were not a lot more fuses.
I suspect part of the reason may be that historically fuses tended to be a common failure point, whether a faulty fuse or simply faulty contacts in the fuse box, so a minimum of them was used.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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