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Old 06-25-2020, 01:11 PM   #1
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Wiring question

I am in a 27 ft ocean master center console with a Steyr Diesel engine. My issue is that when we are running on a plane and hit a bigger wave and therefore a bigger bounce, the engine looses rpm for an instant and then goes back to the same rpm within a second. The mechanic says that he canít think of an explanation from the engine side of it, but thinks that it may be a wiring issue under the console where there may be something coming loose when the bump happens. Thoughts? Also, how do I secure all that wiring? It is kind of hanging from the back side of the console...not fastened to anything.

Jack.
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Old 06-25-2020, 01:14 PM   #2
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Welcome aboard. All wiring on a boat should be secured every 18Ē. That is the standard per ABYC. Go to Home Depot and buy a big bag of black zip ties. Get some that have holes in the end and some that donít have holes. Then start securing the wiring. With the ties that have holes you can screw to something solid to secure the wiring. Good luck.
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Old 06-25-2020, 08:20 PM   #3
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Does the engine truly loose rpm or does the gauge just flutter from the bounce. I can’t see how a wave bump would cause a Diesel engine to change rpms. You can’t trust your ears as sound waves are more affected by a wave bump than a Diesel engine would be.
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Old 06-25-2020, 09:24 PM   #4
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The engine actually shuts off for a second....but comes back on by itself and is at the same rpm as before it hesitated....
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Old 06-25-2020, 11:37 PM   #5
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That sounds like the fuel shut off solenoid is momentarily engaging. That could be caused by a loose wire or connection. Do you have a kill button or do you kill the engine bY turning off the key switch.
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Old 06-26-2020, 07:41 AM   #6
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I am a marine electrician, not a diesel mechanic so this is a guess...could the prop be coming out of the water, starting to overspeed and the ECU shuts down the engine to save the engine from perceived destruction?
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Old 06-26-2020, 09:25 AM   #7
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I am a marine electrician, not a diesel mechanic so this is a guess...could the prop be coming out of the water, starting to overspeed and the ECU shuts down the engine to save the engine from perceived destruction?
I agree with this.....providing itís an electronically controlled engine. Sort of a rev limiter type thing.
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Old 06-26-2020, 12:51 PM   #8
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How long does the engine stay off? Can you estimate a number of revolutions? Is it always the same, or is there a correleation to wave size (bigger wave means off longer)? When you say "off" do you mean no ignition (this is a diesel engine, right), or is there merely a loss of rpms?
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Old 06-26-2020, 01:38 PM   #9
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It is off for about one second. The prop is not leaving the water. It is a mercury dual prop outdrive. I think it is a loose connection somewhere, trying to find it is the challenge.
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Old 06-26-2020, 02:31 PM   #10
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Post #9: With this info, I agree, it is more than likely a poor connection in a harness connector (corrosion, loose pin, bad pin to conductor crimp, etc.). Physically shaking everything should duplicate the problem.
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Old 06-26-2020, 08:19 PM   #11
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I was looking under the console and actually found a wire that was not well seated on the back side of the key switch. I think that might have been the issue. The wire was in place but not secure. I was able to push it back up to secure it....now just need to look for some waves to hit .....
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Old 06-26-2020, 09:47 PM   #12
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Automotive crap wiring. Better get busy with a crimper and some ring terminals and replace all those spade-things and get some marine switches. Pretty silly that a cheap electrical connector can kill your boat. Exciting to be way out there, dead in the water because it's rough!

Might check to see if the builder bothered to use tinned wire too.
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Old 06-27-2020, 12:05 PM   #13
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Originally Posted by plynhky View Post
I was looking under the console and actually found a wire that was not well seated on the back side of the key switch. I think that might have been the issue. The wire was in place but not secure. I was able to push it back up to secure it....now just need to look for some waves to hit .....



If that wire was the RUN terminal that would do it. Consider recrimping the crimps with a good crimper.

Take Xsbank's suggestion into account also.
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Old 06-27-2020, 12:21 PM   #14
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No matter what you find that is actually causing your problem and fix it, you should secure all the wiring so it isnít moving all over the place. It should be secured every 18Ē. So fix the problem and then secure your wiring, it will pay off in the long run.
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