8.1 Won't Crank Over When Engine is warm

[Dasch Boat]

I had a similar problem years ago. Turned out to be a corroded main ground wire on the engine block. Once taken off, cleaned and reinstalled it's never been a problem since. It wasn't due to a warm engine, but that's when it would happen. It was from sitting for a period of time with the stereo on before re-starting. Apparently the batteries were weak enough that the stereo drained the batteries just enough that the current couldn't bridge the corrosion with enough power to start the engine. It would always start cold at the dock, but the batteries were at their best just coming off the charging system. Worth a try.

Thanks for the heads up Jim, I'll take a look at that also.

 

[Dasch Boat]

No joy update, I swapped the port & starboard neutral safety switches with no change and also removed, cleaned and lubed the 4 cables at the engine ground terminal with the same result.

 

[scoflaw]

Start with checking for 12v. at the slave, small y/r wire,then backup checking to see where your losing it. Like I said several posts ago hot wire 12 volts to that terminal to see if that's your problem.

 

[Dasch Boat]

Start with checking for 12v. at the slave, small y/r wire,then backup checking to see where your losing it. Like I said several posts ago hot wire 12 volts to that terminal to see if that's your problem.

Latest Result: I checked the voltage and had 12 volts at the slave solenoid, however I did notice that the wiring diagram which is for an out-drive not a V-Drive shows a separate ground from the slave to the engine block. The V-Drive does not have that wire as the solenoid mounting plate is mounted directly to the engine. I ran a separate ground wire from the solenoid to the engines grounding terminal, so far the issue hasn't recurred but I've only tried it twice. Fingers crossed it holds up next time out.

 

[370Dancer]

It's always one leg or the other, or the stuff in-between..........
Sounds like you found your resistance.