Page 342 - REPOWER REFERENCE GUIDE (2020)

Power Trim Pump
Power Trim Pump

Finding Diagrams

NOTICE
Refer to the appropriate Mercury MerCruiser Diagram Binder for wiring diagrams or other diagrams not found in this manual.
Power Trim Electrical Connection

ABYC (American Boat and Yacht Council) installation recommends installing a battery switch in the positive conductor of any
battery or battery bank with CCA rating greater than 800 amps (see ABYC for additional information).
ABYC further recommends, if a boat is equipped with a battery switch, the power trim pump may not be connected to the
continuously energized circuit (battery). It must be connected to the switched side of the battery switch. Wire length
requirements and location of circuit protection are also specified.
MerCruiser has developed three methods to facilitate compliance with ABYC recommendations. These come in the form of one
standard production and two accessory kits.
• Installations with batteries (or battery banks) rated at less than or equal to 800 cold cranking amps (CCA) and without
battery switches: The trim pump may be installed using the wires supplied with the power trim pump and should be
connected directly to the battery.
• Installations with batteries (or battery banks) rated at more than 800 CCAs (requiring a battery switch) or any boat with a
battery switch: The red current conductor (for the trim pump) must be connected to the switched side of the battery switch
and either:
• provided with circuit protection within 7 inches of the point of connection with the power source or
• provided with circuit protection within 40 inches of the point of connection with the power source and sheathed the
entire length of wire from the point of connection at the source to the circuit protection device. This will require the use
of an Accessory cable kit.

Accessory Part Numbers
Part Number Description Color Length Type
889282A02 Cable assembly – trim pump Red 183 cm (72 in.) Fused and sheathed
889282A01 Cable assembly – trim pump Red 102 cm (40 in.) Sheathed
Power Trim Pump Location
When designing the engine compartment, select an appropriate mounting location for the trim pump that:
• Is in a dry area
• Allows easy access to trim pump oil fill
• Is close to the battery so that the trim pump battery leads can be connected
• Allows clearance so that when the steering wheel is turned right or left, the power steering booster cylinder does not come
in contact with the trim pump. The cylinder moves fore and aft slightly when moved through the steering range.
• Is within the length limits of black and gray hydraulic hoses coming from the gimbal housing assembly
• Within the limits of trim control harness

Page 9C-2 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018