So to start with it's an old I/O a 89 5.0L [Ford] with an OMC Cobra leg.
The problem began this spring.When I started the boat cold everything worked fine but after it had run for a while and I restarted it the starter would continue engaging after the moter fired up.I would kill it, try over [happens 3 out of 5 times] and then continue on.
The boat has a remote starter selinoid that was original that I thought was the problem.I replaced this then started several times at home no problem [not really representing true running temp]
Today I took it out on the water again.Once again fired up fine cold and on the first restart.Second restart the starter ran on again once,killed it,restarted no problem.
We are now 10 miles down the lake in the middle of nowhere all by ourselves.The third restart the starter runs on.I turn the ignition off, still running [starter and moter].I then turn off the battery Perko switch and kill it.We now try disconecting the ignition and turning battery on,still turning over wildly.
We disconect the starter lead, turn on the battery, and touch the lead to the terminal and the boat fires up with the ignition turned off.We cruise the 10 miles back with no issues, normal engine and electrical power and all instruments working.
When we get back and I go to turn the battery off the engine keeps running with the electrical power on the guage varying wildly.I had to pull the lead off the distributor to kill the engine.