Whether to fuse the line when using a fused power supply it depends on where the power supply fuse is before or after the transformer.? Fuses are intended to prevent the wiring from becoming a fire starter.?? In any case, with mobile installations it is necessary to fuse both negative and positive leads as near as possible to the power source.? For fixed station a fuse is not needed on the negative (minus) lead, but certainly won’t do harm if present as are most OEM power cords.? ??Regards, Phil / K4PO

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