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Recommendations
Batteries: Boats with multi-engine EFI power packages require
each engine be connected to its own battery. This ensures that the
engine’s Electronic Control Module (ECM) has a stable voltage
source.
Battery Switches: Battery switches should always be positioned so
each engine is running off its own battery. DO NOT operate engines
with switches in BOTH or ALL position. In an emergency, another
engine’s battery can be used to start an engine with a dead battery.
Battery Isolators: Isolators can be used to charge an auxiliary
battery used for powering accessories in the boat. They should not
be used to charge the battery of another engine in the boat unless
the type of isolator is specifically designed for this purpose.
Generators: The generator’s battery should be considered another
engine’s battery.
CA873
Diagnosing EFI Problems (If Equipped)
NOTE: All references to EFI models apply to EFI and MPI engines.
Your Authorized Mercury MerCruiser Dealer has the proper service
tools for diagnosing problems on Electronic Fuel Injection (EFI)
Systems. The Electronic Control Module (ECM) on these engines
has the ability to detect some problems with the system when they
occur, and store a “Trouble Code” in the ECM’s memory. This code
can then be read later by a service technician using a special
diagnostic tool.
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