Mercury MerCruiser 5.7 Horizon, User Manual

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Section 2 - Getting to Know Your Power Package
Page 34 90-899883173 DECEMBER 2007
A circuit breaker provides protection for the engine wiring harness and the instrumentation
power lead. Test the circuit breaker by pushing the red button. If the circuit breaker is
functioning properly, the yellow lever appears. Push the yellow lever into the housing to
reset the circuit breaker.
b
a
22529
a - Yellow lever (shown tripped)
b - Red test button
A 90 amp fuse is located on the large post of the starter solenoid. This fuse is designed to
protect the engine wiring harness if an electrical overload occurs.
mc74907-1
Four fuses are located on the port side of the engine. These fuses protect the main power,
fuel pump, ignition, and accessory circuits.
33214
Engine fuses