Single Engine Trim/Trailer; Dual Engine Trim/Trailer; Electrical System Overload Protection-350/377 Mag Ect And Seacore 350/377 Mag Ect - Mercury 350 MAG Manual

Section 2 - Getting to Know Your Power Package
• Cause engine overheating if trimmed up/out to a point where any cooling water intake holes are above the water line
Trimming sterndrive unit down/in can:
• Help the boat accelerate and plane off quicker
• Generally improve the ride in choppy water
• In most cases, reduce boat speed
• If in excess, lower the bow 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/Trailer

Single engine applications will have a button that can be pressed to trim the sterndrive unit up or down.
To raise the sterndrive unit for trailering, beaching, launching, low speed (below 1200 rpm), and shallow water operation push the
trim button to raise the sterndrive unit 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 DTS control system limits the extent to which the sterndrive unit can be trimmed up/out when engine speed is above
3500 RPM.

Dual Engine Trim/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 sterndrive units simultaneously or may have separate
buttons for each sterndrive unit.
Some controls also have a trailer button that trims the sterndrives to a position suitable for trailer purposes only.
Electrical System Overload Protection—350/377 MAG ECT and SeaCore
350/377 MAG ECT
If an electrical overload occurs, a fuse will blow or the circuit breaker will trip open. The cause must be found and corrected before
replacing the fuse or resetting the circuit breaker.
NOTE: In an emergency, when you must operate the engine and cannot locate the cause for the high current draw, turn off or
disconnect all accessories connected to the engine and instrumentation wiring. Reset the circuit breaker. If the breaker remains
open, the electrical overload has not been eliminated. Contact your authorized dealer.
The circuit breaker provides protection for the engine wiring harness and the instrumentation power lead. To test or reset the
circuit breaker:
1. Remove the engine cover.
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