Re: ’93 15hp electric start issue

[Don]

I remember learning about the voltage drop test in OMC training, but being completely stumped as to how/why it worked. Years later, I think it makes sense to me. It is important to perform these drop tests just as outlined in the manual to avoid false conclusions and replacing expensive parts needlessly. In this case, my money would have been on that "CPS" switch, but the problem could have been something as simple as a corroded cable or lousy connection somewhere. The voltage drop tests, when performed properly, can isolate each cable and connection….
Before doing the voltage drop tests, it is very important to verify battery condition (load tests), and starter condition. In this case, Joel verified that the starter was OK by hardwiring it to the battery and it worked OK.