Electrical System Overload Protection; Auto Trim Limit Adjustment; Boat Properly Trimmed - Diagram; Boat Too High/Too Low - Diagrams - Mercury BRAVO Service Manual

AUTO TRIM II

Electrical System Overload Protection

The Auto Trim electrical system is protected from overload by a 110-amp fuse, and a 20-amp
in-line fuse at control module positive (+) battery lead and a 20-amp in-line fuse at ignition
switch (if Quicksilver ignition switch is used). If boat is equipped with 3-Button Control Panel,
a 20-amp in-line fuse also is located at panel. If Auto Trim electrical system becomes
inoperative, check for a blown fuse. If fuse has blown, the cause for overload MUST BE
found and corrected BEFORE replacing fuse.

Auto Trim Limit Adjustment

In most cases, best all-around performance is obtained with sterndrive unit adjusted so that
front of hull will be slightly out of water when boat is on plane.
Adjusting the sterndrive unit OUT from this position will tend to raise the bow of the boat,
reducing the wetted surface of the hull and, in some cases, increasing boat speed. If
trimmed out excessively, bouncing, porpoising, propeller ventilation and possible difficult
steering control could result.
Adjusting the sterndrive unit IN from normal position will force the bow of the boat down,
increasing the wetted surface of the hull and, in some cases, improving boat ride in rough
water (at partial throttle). However, this will reduce boat speed.
Page 5D-6
Boat Properly Trimmed
Bow Too High - Move Sterndrive Unit IN
Bow Too Low - Move Sterndrive Unit OUT
SERVICE MANUAL NUMBER 28
90-863160 MAY 2000