I load up my ignition circuit pretty heavily - without a single issue by the way - and still remain under 80% of the 10 amp fuse value.
Ignition load = 3.4 amps
Alternator excite = 0 amps (single wire self excite)
Facet fuel pump = 1.6 amps
Johnson CM30P7-1 coolant pump = 2.2 amps
EWDS = 0 amps (by design, no draw unless triggered)
Total ignition circuit load = 7.2 amps
Point being, even with considerable loads on the ignition circuit a 10 amp fuse is fine under normal conditions. That your fuse was blown indicates a circuit or device problem as mentioned by others.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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