I would be inclined to separately fuse the lights as well, since these are the most likely place for shorts.
The only safe way to run negative earth accessories off your system is to change to negative earth. The only wiring change needed is to reverse the connections to the ammeter, and to change the battery connections (new clamps or probably cables).
Once this is done, connect the battery, and create some remnant magnetism in the generator by momentarily connecting the battery to the generator, most easily by removing the cover from the voltage regulator and manually closing the cutout points.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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