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Mercury 300R HD CMS Mechanical User Manual

Mercury 300R HD CMS Mechanical
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3. Battery cable terminals should be clean, tight, and correctly installed.
Positive to positive and negative to negative.
4. Ensure the battery is equipped with a nonconductive shield to prevent
accidental shorting of battery terminals.
Battery Cables and Clean Power Harness
The battery cable connections should be checked often for corrosion or loose
retaining hardware. Maintaining this electrical connection helps ensure the
engine operation and accessories functionality remains trouble‑free. The
engine starting battery cables and the clean power harness wires must be
secured to the engine starting battery with nuts. Wing nuts are not acceptable.
The clean power harness must be secured to one of the battery cables with a
cable tie or other type of secure fastener.
a - 14‑pin data harness
b - Clean power harness connector at engine
c - Clean power harness
d - Battery
e - Negative engine battery cable
f - Positive engine battery cable
If the clean power harness fuse is open, try to locate and correct the cause of
the overload. If the cause is not found, the fuse may open again. Remove the
clean power fuse and look at the silver band inside the fuse. If the band is
broken (open), replace the fuse with the same rating (5 amp) and type fuse.
c
a
b
26984
d
e
f
MAINTENANCE
eng 55

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Mercury 300R HD CMS Mechanical Specifications

General IconGeneral
BrandMercury
Model300R HD CMS Mechanical
CategoryOutboard Motor
LanguageEnglish

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