Should be just the Helm Power Circuit Breaker. Are you sure you are getting power out of that CB? When you say "fuse" I assume you are refering to the Helm Power Safety (CB or Fuse, not sure which you particularly have), which should be close to the battery. From the drawings for my boat, that's the only interrupt between the Batt and the Pos (+) at the hlem circuit (fuse) panel.
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Walt B
"Debt-Charged"Black '07 H210SS6.2L Bravo One turning a 21P HIFive
Wakeboard Tower with Perfect Pass Stargazer version
Missouri River; Kansas City, Mo.