Curt - my apologies - I saw your note but had 'Kenny' on the brain .... Ivan at RangerTugs said that it should be same as R27 so I am going to get that manual downloaded. The manual for the R-25 is missing a lot of stuff that I think came out in subsequent manuals ... I I was in submarines in Navy and the manuals were comprehensive and a real aid to troubleshooting .... it would be nice if Ranger could expand their manuals, but I have found most civilian manuals are usually missing a lot of info, so Ranger is better than most ... and I did see some schematics for a 31 so I am hoping to have enough clues to get to serious discovery .... had some things come up and have not been out to boat in some days, but (a) I am hoping the factory methodology is fairly standard and that each installation is not a new science fair experiment 🙂 and I will figure out the logic. When I find out and get a real answer and solution I promise to do a drawing and publish it out here - I cannot think I am the only one this has happened to. I want to thank everybody who is giving me ideas of where to look .... I will find it eventually. Many many thanks to all ...Doug