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Old 09-08-2009, 11:32 AM
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Question Boat won't shut off??

I have a 200 Starcraft 2010 LX open bow. The I/O engine is a Mercruiser 5.7L. I am new to this boat and new to boating so excuse any vagueness!
Issue started when the engine would not shut off. Turned key off, nothing. Hit Kill switch, nothing, pulled the key out! nothing.

Finally un-hooked the battery and it still was running until I turned the key to Start again and that killed the engine. Since then it was working for a while then I found out something was still pulling on the battery while the boat was off and docked (quite hum coming from the engine) and the battery was dead when I went back to it. The battery has since been recharged but was wondering if anyone had any ideas on where the issue lies? Is it electrical? mechanical? Is it the starter/ignition?

Any suggestions would be great!
Thanks
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Old 09-08-2009, 12:34 PM
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Sounds like the ignition switch, but I'm not positive. Get a meter and check it out. Should have three connections on the back (ground, start, and run). Meter connected ground to start, should only get continuity when key is turned to start. Meter connected ground to run, should only get continuity when key is in start or run position. Key off, no continuity. Bad news is that by disconnecting the battery with it running, you may have fried the alternator. Good luck and let us know how it goes!!
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Old 09-08-2009, 01:15 PM
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thanks for your feedback...hopefully it's not the bad news. that strategy was actually advice from a mechanic over the phone!!!
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Old 09-08-2009, 01:17 PM
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ps...any idea what replacing an alternator will cost me?
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Old 09-08-2009, 01:54 PM
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Not sure the cost of a new alternator,.... however the problem you intitially described unlikely has anything to do with your alternator,.. the "humming sound" can be caused by a few things, you want to eliminate the obvious first, check if you left something on like a bilge pump, live well, raw water wash down pump or something like that, if the all the electrical switches are off .... it may still be a bilge or raw water wash down pumps as many times they are wired directly to your battery,... if you have a battery switch ?.. turn it off,.. does the humming stop ?...if it's humming it should fairly easy to pin point where it's coming from ... i'm not familiar with a 5.7 IO but it might have an electric fuel pump,..also check tilt and trim hydraulic pump,.. does your boat have trim tabs ?.. check your trim tab pump,... this should keep you busy for an evening,.. good luck ...
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Old 09-08-2009, 02:38 PM
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Bet its the ignition switch or one of the wires on your harness is loose.
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Old 09-08-2009, 03:51 PM
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Quote:
Originally Posted by danch13 View Post
ps...any idea what replacing an alternator will cost me?
I just had to replace mine about 2 yrs ago, but don't remember the exact price. I'm thinking somewhere between $150 and $200??? Remember to make sure you get a marine alternator and not one for an auto!!! Another option (if the alt IS actually bad now) is to find a local shop that rebuilds alternators and starters. They can test it for you, too (auto shop was not able to test the marine alt for me). I think the part that goes when the battery is disconnected is the voltage rectifier or something similar in that circuit. They may be able to replace it for a lot less than the cost of a new alt. Get the shut off problem solved first, then get the alt tested. You can run the motor without the alt (it just won't recharge the battery), but with newer systems you can't run the alt without a battery. The alternators sense the voltage/current required to keep the battery charged and vary output accordingly. When you disconnect the battery, they keep trying to increase the output from the alt until something finally gives. Not like the good old days when disconnecting a battery was a sure-fire way to test the alt!! Good Luck!!
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Old 09-08-2009, 04:03 PM
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One more thing..... When I described testing the switch, I said the terminals were ground, start, and run. That should be HOT or POWER, start, and run. Might even be labeled as COMMON on some switches. Just want to make sure you don't go crazy looking for a "ground" terminal!!! Also, someone suggested a possible loose wire. I don't think this would be possible. The ignition switch just feeds the engine power (either to the ignition module or to the starter solenoid). When you turn the key to "off" all you are doing is simply removing that power source and killing the engine. If an engine wouldn't turn over or stay running, then a loose wire is a possibility, but if it won't shut off it is a different problem. For future reference, look around your engine for the wires that power the fuel pump or the ignition module. If you ever need to shut down the engine, disconnect one of these and you won't have to worry about alternator damage.
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Old 09-08-2009, 05:23 PM
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you leave the bilge blower on ? that sometimes sounds like a humming noise
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Old 09-08-2009, 05:28 PM
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Quote:
Originally Posted by danch13 View Post
I have a 200 Starcraft 2010 LX open bow. The I/O engine is a Mercruiser 5.7L. I am new to this boat and new to boating so excuse any vagueness!
Issue started when the engine would not shut off. Turned key off, nothing. Hit Kill switch, nothing, pulled the key out! nothing.

Finally un-hooked the battery and it still was running until I turned the key to Start again and that killed the engine. Since then it was working for a while then I found out something was still pulling on the battery while the boat was off and docked (quite hum coming from the engine) and the battery was dead when I went back to it. The battery has since been recharged but was wondering if anyone had any ideas on where the issue lies? Is it electrical? mechanical? Is it the starter/ignition?

Any suggestions would be great!
Thanks
I'm assuming it is not a new boat and didn't come with any warranty.

I suggest you have a qualified mechanic find and repair the problem. Also, have this person or a more experienced boater go over the boat with you and explain how everything works and when and how to use it.

If you want, you can start working on your own boat once you know what everything is and how it is supposed to work.
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Old 09-08-2009, 06:45 PM
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It's been a few years since I had my 5.7L but it did the exact same thing. Mine was "diesaling"... running without a spark. I had to turn the key back on and then off again.

Check the timing, that is one potential cause. Also check the idle stop solunoid on the throttle plate and make sure it releases with the key off.

Wish I could remember more but it's been a few years... good luck
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Old 09-09-2009, 01:46 AM
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This problem may be caused by a bad diode in the hot wire going from the alternator to the coil. You can actually get a replacement for this at radio shack.
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Old 09-09-2009, 06:40 AM
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Rwidman is correct. Not a new boat it's a 2000 and I just got it this season... your advice to get a certified mechanic on the job is well taken also. I have one looking at the boat today. All the advice has been great and has helped with my leaning curve. Hopefully the news is not too bad and that soon I will be able to diagnose and work on the boat myself.
THANKS ALL
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