I'm having the same problem. I'm going to replace the 40amp relays this weekend. I will let you know.
I replaced the 40 amp circuit breaker and both relays under dash, still no power.
When Hurricane run the main 12v line, they through the connectors in the bilge. Mine were badly corroded and two wires corroded off. The connector is located in the small access cover in the lower console. By the way my boat is brand new, with only 15 hours on the motor.