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If excessively trimmed down (in), may lower the bows of some boats to a point at which they begin to plow with their bow in
the water while on plane. This can result in an unexpected turn in either direction called bow steering or over steering if any
turn is attempted or if a significant wave is encountered.
Single-Engine Trim and Trailer
Single‑engine applications have a button that can be pressed to trim the sterndrive up (out) or down (in).
To raise the sterndrive for trailering, beaching, launching, low‑speed (below 1200 RPM), and shallow water operation, push the
trim button to raise the sterndrive to the full up (out) position.
Some controls also have a trailer button that trims the sterndrive to a position suitable for trailer purposes only.
NOTE: The Engine Control Module (ECM) limits the extent to which the sterndrive can be trimmed up (out) when engine speed
is above 1200 RPM.
Dual-Engine Trim and Trailer
If using external tie bars, raising or lowering the drives independently of each other can damage the drive and steering
systems. If using an external tie bar, raise and lower all drives together as a unit.
Dual‑engine applications may have a single integral button to operate both sterndrives simultaneously or may have separate
buttons for each sterndrive.
Some controls also have a trailer button that trims the sterndrives to a position suitable for trailer purposes only.
Engine Electrical System Overload Protection
If an electrical overload occurs, a fuse will burn out (blow). Find and correct the cause for the electrical overload before
replacing the fuse.
NOTE: In an emergency, when the engine must be operated and the cause for the electrical overload cannot be located and
corrected, turn off or disconnect all the accessories connected to the engine and instrumentation wiring. Replace the blown
fuse. If the replacement fuse also blows then the electrical overload has not been eliminated. Further checks must be made on
the electrical system. Do not circumvent the electrical overload protection provided on fused circuits by installing a
higher amperage fuse or shorting across the fuse block terminals.
Fuses provide protection for the engine electrical system as indicated. The fuse panel is located beneath an access panel in
the front of the engine cover.
b
90-8M0069751
APRIL 2012
eng
Section 2 - Getting to Know Your Power Package
NOTICE
Contact your Mercury Diesel authorized repair facility.
a
2.0 engine cover with access panel
a -
Engine cover access panel
b -
Fuse panel
26993
mc79530
Page 19
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