How to Wire a Trim Motor for a Boat

A boat's trim and tilt unit tilts the outboard motor so that the boat is driven through the water as levelly as possible, regardless of the distribution of passengers or gear aboard. The trim and tilt unit uses a hydraulic piston to trim the outboard up and down. The pump that moves the hydraulic fluid into and out of the piston is electric, with self-contained wiring. If the pump goes bad, the plug-and-play wiring simplifies its replacement.

Things You'll Need

  • Moisture-excluding spray lubricant
  • 5/16-inch box-end wrench
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Instructions

    • 1

      Push the male bullet terminals into the female terminals on the trim relay connector plug. The male terminals of are different sizes, to prevent cross-connections.

    • 2

      Spray the trim relay connector plug with a spray moisture-excluding lubricant. Spray the interior of the trim relay connector with spray moisture-excluding lubricant.

    • 3

      Push the trim relay connector plug into the trim relay connector. Twist the relay connector plug clockwise to lock the pins around its rim into the trim relay connector.