PCM 2003 5.0L MPI, Owner'S Operation And Maintenance Manual

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L510010-03
C.C.
ENGINE MAINTENANCE - 11
ELECTRICAL SYSTEM CIRCUIT BREAKER
Main Circuit Breaker
PCM engines are equipped with a circuit breaker which
provides electrical overload protection for both engine
and instrumentation wiring and components. Should an
electrical overload occur, the circuit breaker will open
and prevent electrical current fl ow.
When this circuit breaker opens, the cause for the high
current draw must be found and corrected. The circuit
breaker can be reset by pushing the “Reset” button IN
after waiting a few minutes. If the cause of the overload
cannot be found, disconnect all accessories which are
connected to the main wire harness.
If resetting is still not possible, check the battery and
alternator connections and all other harness connectors
on the main harness. Check for loose or disconnected
lead wires and shorted circuits.
ELECTRICAL SYSTEM FUSES
PCM engines utilizes fuses to control the fuel pump,
ECM and fuel injectors. The fuse block is mounted to
a bracket near the exhaust elbow under a weather-tight
cover.
Figure 11-5 Typical Electrical System Circuit Breaker
and Fuses
IGNITION FUSE
If the engine will not crank when the ignition key is turned
to the START position, fi rst check that the shift lever is in
neutral position. If the main circuit breaker is not tripped,
check for blown ignition fuse. The ignition fuse may be
located on the instrument panel, the fuse holder block
or as part of the instrument wiring harness. Check the
wiring diagrams supplied from the boat manufacturer for
the exact location.
ELECTRICAL SYSTEM WIRING AND
CONNECTORS
The electrical system wiring and connectors should be
checked periodically for loose or dirty connections and
damaged wiring. If electrical components or wiring show
signs of corrosion, deterioration or damage, consult a
PCM Engine dealer to make necessary repairs.
FUSE BLOCK
CIRCUIT
BREAKER