Section 1 - Getting to Know Your Power Package
Page 12 90-8M0113987 eng DECEMBER 2015
Circuit breakers provide protection for the engine electrical system. The circuit breaker panel is located beneath a small access
panel in the engine cover on top of the engine.
Typical engine cover with access panel
a - Engine cover
b - Circuit breakers
After finding and correcting the cause of the overload, reset the circuit breaker by pressing the reset button.
Circuit breakers viewed from the port side of the engine
Reference Circuit breaker rating Protection Location on fuse panel
a 20 A Key unswitched power to helm Lower left
b 10 A Switched power to ECM Upper left
c 10 A Key switch to ECM Middle left
d 15 A Switched power to ECM Middle right
e 15 A ECM switched power to SIM Upper right
f 5 A Power—diagnostic connector Lower right
Overload Protection—Port Side Power Distribution Box
If an electrical overload occurs, a fuse will burn out (blow) or a circuit breaker will trip open. Find and correct the cause for the
electrical overload before replacing the fuse or resetting the circuit breaker.
NOTE: In an emergency, when the engine must be operated and the cause for the high current draw cannot be located and
corrected, turn off or disconnect all the accessories connected to the engine and instrumentation wiring. The circuit breaker
should automatically reset. If the breaker remains open, the electrical overload has not been eliminated. Further checks must
be made on the electrical system. Contact your Mercury Diesel authorized repair facility.
Circuit breakers provide protection for the engine electrical system as indicated. The circuit breaker panel is located within a
power distribution box mounted on the engine control module.
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