Mercury 350 MAG MPI Horizon, Service Manual

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CC1002
Electrical System Overload Protection
If an electrical overload occurs, a fuse will blow or the circuit breaker will trip open. The cause must be found
and corrected before replacing fuse or resetting circuit breaker.
1
A circuit breaker provides protection for engine wiring harness and instrumentation power lead. Reset by
pushing RESET button IN.
NOTE: In an emergency, when engine must be operated and cause for high current draw cannot be located
and corrected, turn OFF or disconnect all accessories connected to engine and instrumentation wiring. Reset
circuit breaker. If breaker remains open, electrical overload has not been eliminated. Further checks must be
made on electrical system.
2
A 90 Amp fuse is located on the starter solenoid. This fuse is designed to protect the engine wiring harness
if an electrical overload occurs.
3
Three fuses are located on the port side of the engine. These fuses control various EFI circuits.
A
Fuel Pump Fuse - 15 Amp
B
ECM / Injector Fuse - 10 Amp
C
ECM / Battery Fuse - 15 Amp
4
A 20 amp fuse may be located in ignition switch “I” terminal lead to protect electrical system. Check for blown
fuse if key is turned to START and nothing happens (and circuit breaker is not tripped).