What outboard do you have? With my pontoon there is a wiring harness coming from the motor for the gauges. And a inline 50 amp fuse from the battery for power for the lights and gauges. The wiring is color coded by the motor brand as someone posted above.Hi all, I have a 1990 Sun Tracker Party barge 24 feet long. I am looking for a wiring diagram as complete as I can get it. Thanks guys.