Re: 1977 Evinrude 25 wiring harness Home › Forum › Ask A Member › 1977 Evinrude 25 wiring harness › Re: 1977 Evinrude 25 wiring harness fleetwinUS Member - 2 YearsReplies: 4737Topics: 46 July 27, 2017 at 1:56 pm #62269 The wiring harness’ for these years is a bit of a unique design, and can be tough to find….If the original pieces can’t be found, you can always used both harnesses from a red plug engine, the engine end can be adapted to fit fairly easily….