Re: ’93 15hp electric start issue

[Don]

Yeah, attending current BRP training would not help with the engines you/we are working on. Needless to say, BRP has little/no interest in carbureted engine produced by OMC years ago. I’m pretty sure the voltage drop test is outlined in most of the OMC manuals of the late 80s/90s era for engines that had electric start.
Go to the electrical section of the manual, and look for the voltage drop test in the chapter outline/table of contents. Like I say, the tests will seem very strange, and the methodology will make no sense (at least didn’t to me), but it works and all but eliminates the usual guess work when troubleshooting 12 volt cranking problems. The key to understanding how the tests work is in the terminology itself: "voltage drop test". You are simply measuring the difference in voltage potential between the two ends of a cable/wire, or the two sides of a connection.
Again, it is very important that the tests be performed exactly as they are written to avoid false conclusions or a damaged volt meter!