mercruiser trim sender wiring - riverracer May 27, 2007LOOK AT THE BACK OF THE GAUGE. The gauge will be marked on the back. "I" for ignition (purple), "S" for sender (brown/white), "G" for ground (black). The colors I listed are standard Mercruiser wire colors in a factory loom. There are two wires from the trim sender, one goes to ground and the other to the "S" terminal on the gauge. Related searches for mercruiser gauge wiring mercruiser trim gauge wiring diagrammercruiser trim wiring diagrammercruiser power trim wiring diagrammercruiser trim system wiring diagrammercruiser trim sensor wiring diagrammercruiser trim sender wiring diagrammercruiser trim sender wiringmercruiser tilt trim wiring diagram