Mercury MERCRUISER, Service Manual, Page: 332 / 566

Precautions
!
WARNING
Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on Mercury Marine products comply with
federal and international standards to minimize risk of fire or explosion. Do not use replacement electrical or fuel system
components that do not comply with these standards. When servicing the electrical and fuel systems, properly install and
tighten all components.
!
WARNING
Neglect or improper maintenance, repairs, or inspections of the power package can result in product damage or serious injury
or death. Perform all procedures as described in this manual. If you are not familiar with proper maintenance or service
procedures, consign the work to an authorized Mercury Marine dealer.
!
WARNING
Performing service or maintenance without first disconnecting the battery can cause product damage, personal injury, or
death due to fire, explosion, electrical shock, or unexpected engine starting. Always disconnect the battery cables from the
battery before maintaining, servicing, installing, or removing engine or drive components.
!
WARNING
Explosive fumes contained in the engine compartment can cause serious injury or death from fire or explosion. Before
starting the engine, operate the bilge blower or vent the engine compartment for at least five minutes.
!
WARNING
Fuel is flammable and explosive. Ensure that the key switch is off and the lanyard is positioned so that the engine cannot
start. Do not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated
and avoid prolonged exposure to vapors. Always check for leaks before attempting to start the engine, and wipe up any
spilled fuel immediately.
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
IMPORTANT: To avoid damaging the electrical system, follow these precautions:
•
Do not tap accessories into the engine harness.
• Do not puncture wires for testing (probing).
• Do not reverse the battery leads.
• Do not splice wires into the harness.
• Do not attempt diagnostics without the proper, approved service tools.
General Information
IMPORTANT: If all instruments are inoperative an electrical overload may have blown a fuse or tripped a circuit breaker. The
cause of the overload must be corrected before returning the boat to service.
The initial investigation into instrumentation malfunctions should begin with the following:
•
Confirm that the battery is fully charged.
• Check all fuses and circuit breakers.
• Inspect for wiring damage and loose or broken connectors.
• Ensure that all wiring connectors are properly connected and free of corrosion.
Lubricant, Sealant, Adhesives
Tube Ref No. Description Where Used Part No.
25
Liquid Neoprene Electrical terminals and connections 92- 25711 3
Instrumentation and Controls
Page 4D-2 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015