Electrical System Relay And Fuse Block; Electrical System Fuses; Boat's Ignition Fuse; Electrical System Wiring And Connectors - PCM HO303 MPI Owner's Operation And Maintenance Manual

ENGINE MAINTENANCE - 11
ELECTRICAL SYSTEM RELAY AND FUSE
BLOCK
MAIN PANEL FUSE
PCM engines are equipped with a 40 Amp PANEL fuse
which provides electrical overload protection for the
boat's instrumentation wiring and components. Should
an electrical overload occur, the PANEL fuse will open
and prevent electrical current fl ow.
When this fuse opens, the cause for the high current
draw must be found and corrected. Check the battery
and alternator connections and all other harness
connectors between the boat and the engine main
harness. Check for loose or disconnected lead wires
and shorted circuits. Replace the PANEL fuse and
resume operation. If the cause of the overload cannot
be found, consult an authorized PCM Engines dealer to
make necessary repairs.

ELECTRICAL SYSTEM FUSES

PCM engines utilize fuses to protect critical engine
components and devices. The fuel pump, ECM, ignition
components, fuel injectors, starter and diagnostic
devices are protected by fuses. The fuse block is
mounted on a bracket near the rear of the engine.

BOAT'S 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 the neutral position and the safety lanyard
(if equipped) is attached properly. If none of the Fuse
Block fuses are open, check for a blown boat ignition
fuse. The boat's ignition fuse may be located on the
instrument panel, the fuse holder block or as part of
the helm's 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 an
authorized PCM Engines dealer to make necessary
repairs.
32
Figure 11-7 (Typical) Electrical System Relay and Fuse

BATTERY

Battery electrolyte is a corrosive acid and should
be handled with care. If electrolyte is spilled or
splashed on any part of the body, IMMEDIATELY
fl ush the exposed area with liberal amounts of water
and obtain medical aid as soon as possible. Safety
glasses and rubber gloves are recommended when
handling batteries or fi lling with electrolyte.
L510010-11
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15
Block
WARNING