Boat

Have Boat Questions? Ask a Boat Repair Expert.

Ask an Expert,
Get an Answer ASAP!

I've traced a ground fault to within my Yamaha 150 outboard.

Customer Question
But I can't figure out...
I've traced a ground fault to within my Yamaha 150 outboard. But I can't figure out where the current crossover is occurring. If I disconnect the main black electrical harness in the engine, the fault remains. If I disconnect the hot wires at the solenoid, it disappears. The smaller of the two red wires connected to the solenoid creates a full 12V ground fault, but I can't trace where that red wire goes. Nothing visually obvious wrong.
Submitted: 2 years ago.Category: Boat
Show More
Show Less
Ask Your Own Boat Question
Answered in 1 minute by:
6/8/2015
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,010
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
Verified
Hello my name is ***** ***** am I speaking with?
I don't quite understand what it is you are doing. What problem is the engine having that you are trying to correct?
Ask Your Own Boat Question
Customer reply replied 2 years ago
My name is Tom. Do you know what a ground fault is? I'm loosing current, through some unintended circuit. I've disconnected all the fuses to things like lights, horn, wash down pumps, bait aerator pump, radio, etc. So, none of the red (positive circuits) should be drawing current. When I attach a volt meter from the positive lead of the battery, to the (disconnected) positive wire that runs to the engine, I read 12 volts. It should read zero if nothing is drawing current, or completing the circuit (like I said, I've disconnected all other circuits).
Customer reply replied 2 years ago
Should I expect a reply, or are you done with this question?
Customer reply replied 2 years ago
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
I don't quite understand, is the battery running dead on you when the engine sits, is that what is going on?
Ask Your Own Boat Question
Customer reply replied 2 years ago
I haven't noticed it running down when it sits, but I always turn off my battery selector switch. When running the boat is running at idle speeds, I notice that the voltage being received at my chart plotter fluctuates between 10-11 volts, which sometimes causes it to shut off. And the horn won't work. If I rev the engine, the voltage will rise to 13, and the horn works. After a day on the water, the battery is run down. Using my voltmeter, I tested for a ground fault, and see that I have one. And that takes me back to my previous statement, of having disconnected all the power drawing circuits (including the bilge pump), and still see current flowing across the positive lead.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
What does the voltage read at the battery terminals with the engine running in the 1500-2k rpm range?
Ask Your Own Boat Question
Customer reply replied 2 years ago
Around 13.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Okay that's to low, you should be between 14.1 and 14.9, at 13 it's not really charging. Have you located the 50 amp fuse on the engine, an if so, is that fuse good?
Ask Your Own Boat Question
Customer reply replied 2 years ago
It is charging, perhaps a bit low. I'm reading the current coming out of the battery (not going in), so I wouldn't expect it to be much higher than 12-13.
Yes, the 50 amp fuse is ok. I notice that if I pulled that fuse, the ground fault disappears. I assume that fuse is between the alternator and the battery.Do you understand what I mean when I say a "ground fault". It's not a "short circuit", but rather a "minor" leakage of current from a positive wire to another ground somewhere.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Do you understand what I mean when I say a "ground fault". It's not a "short circuit", but rather a "minor" leakage of current from a positive wire to another ground somewhere.
I don't think you understand what a ground fault is. This is all DC electricity you are working this, there is no such thing a ground fault in DC. In AC, where you have 3 wires, a Hot a neutral and a ground. A technical "short circuit" is when hot touches neutral. And a technical "ground fault" is when hot touches ground.
Since this is DC electricity lets try not to use the word ground fault. It is improper. With DC circuits there are only 3 possibilities. An open circuit, a short circuit, and a functioning circuit. And that's it.
The problem you are having is your charge voltage is to low. It needs to be 14 or better. Run the engine again, ground the meter negative lead to battery negative, and then check voltage at the 50 amp fuse. does voltage come up?
Ask Your Own Boat Question
Customer reply replied 2 years ago
My chartplotter shows that it is only getting 10 volts from a fully charged battery. A short circuit would blow a fuse, an open circuit wouldn't allow it to turn on. Somewhere I'm loosing current (hence the term ground fault). I'm not making up the terminology. It's widely used in boating. It describes what I'm witnessing immediately (i.e., not after a period of time when a fully charged battery runs down). Thanks for the attempt to help, but I think its best to end this Q&A.
Marine Mechanic: Jason, Marine Mechanic replied 2 years ago
Your thinking of "Voltage Drop"....... Not ground fault. And really you are confusing yourself here because you don't understand what the words mean.
I will opt out.
Ask Your Own Boat Question
Was this answer helpful?
Ask Dominick Your Own Question
Dominick
Dominick
Dominick, Marine Mechanic
Category: Boat
Satisfied Customers: 1,009
1,009 Satisfied Customers
Experience: 25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Dominick is online now

A new question is answered every 9 seconds

How JustAnswer works:

  • Ask an ExpertExperts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional AnswerVia email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction GuaranteeRate the answer you receive.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Dominick

Dominick

Marine Mechanic

1,009 satisfied customers

25 Years Experience as Mechanic, 20 Yrs Boat Yard Owner/Mechanic, Factory Certified

Ted G.

Ted G.

Rigger, Diagnostician

695 satisfied customers

40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness

John White

John White

Marine Mechanic

306 satisfied customers

11 years experience working on outboards, inboards, sterndrives & pwcs

Jason

Jason

Marine Mechanic

17,010 satisfied customers

Degree in Marine Technology. Gas and diesel marine mechanic.

Tan

Tan

MerCruiser Certified Technician

11,003 satisfied customers

40 yrs. experience with complete engine repairs both inboard/outboard and MerCruiser Certified Technician.

Jeff G.

Jeff G.

Marine Mechanic

4,728 satisfied customers

42 years experience, Certified Master Technician, All Major Outboards, Sterndrives, Hi-Performance

Captain Dave

Captain Dave

Marine Mechanic

2,672 satisfied customers

USCG Licensed Captain, 20+ Years Boating, Fishing, Maintenance and Repair Experience

< Previous | Next >

Related Boat Questions
I have a 2011 150hp Honda that I get a similar condition to
I have a 2011 150hp Honda that I get a similar condition to what I just read Kee is experiencing. Low RPM's run great but after I come to full power and after a few minutes I get a slow beeping sound … read more
Boat Doc
Boat Doc
205 satisfied customers
I have a 1998 150 FICHT with a check engine ligt on solid
I have a 1998 Johnson 150 FICHT with a check engine ligt on solid and an alarm that is intermittent. The alarm will come on at different times and doesn't appear to be related to idle or high speed. T… read more
Boat Doc
Boat Doc
205 satisfied customers
I just purchased a pontoon with a 50hp motor and it will
I just purchased a pontoon with a 50hp Johnson motor and it will crank but wont start. it is missing the emergency shutoff lanyard but is still grtting spark. … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
I have a 92 Alumacraft Dominator. I replaced the fuel gauge
Hi and good morning. I have a 92 Alumacraft Dominator. I replaced the fuel gauge and now am having some electrical problems, when I turn on my navigation lights the fuel gauge goes all the way up past… read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
Temp gauge not working on V-8, I don't know if is gauge or
I don't know if is gauge or sending unit or broken wire … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
I have a 1993 115hp 2 stroke outboard motor that starts
I have a 1993 115hp 2 stroke outboard motor that starts missing and won't run above 2200rpms. I have replced the fuel pump and filter, the coils, fuel lines and stator and spark plugs. I have cleaned … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
C 60 ray marine screen the depth finder part does not come
c 60 ray marine screen the depth finder part does not come on? … read more
Boat Doc
Boat Doc
205 satisfied customers
I have a 2012 Super Air Nautique. Had it out last Sunday
I have a 2012 Super Air Nautique. Had it out last Sunday everything was fine. Today dropped in and the steering wheel is totally locked up and will not budge. I have had 8 nautiques and never experien… read more
Boat Doc
Boat Doc
205 satisfied customers
I have a100 sea ray 1989 it seems to run fine I put it in
I have a100 sea ray 1989 it seems to run fine I put it in the water and I have to pump the ball to keep it running … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
How are you. I need your help for a friend with a "Yamaha
Jason how are you. I need your help for a friend with a "Yamaha 200HP fuel injected outboard. Let me know if you can help and how I can pay for another free trial on his end.… read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
I own a 16 ft Crestliner with a 2004 Mercury 50 hp engine
I own a 16 ft Crestliner with a 2004 Mercury 50 hp engine which I purchased brand new. I fish Lake Erie exclusivelyand this requires a reliable engine! This outboard has NEVER let me down........until… read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
With the water flush on it runs great in the driveway, even
with the water flush on it runs great in the driveway, even if you put it in gear it's smooth and accelerates great. Put it on the water it idles great, put it in gear and try to accelerate and it die… read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
I didn't know that the outdrive couldn't be run tilted up. I
I didn't know that the outdrive couldn't be run tilted up. I just finished s tuneup and started the 454 with bravo 3 and the tilt was most of the way up. I revel to 3500 rpm and was feeling a vibratio… read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
Recently purchased a lowrance boat package (gen 3 with 9 on
Recently purchased a lowrance boat package (gen 3 with 9 on console and 7 up front). Put it in the water yesterday and powered up. After answering the setup questions I paged to the sonar screen. Inst… read more
Clamp-onTech
Clamp-onTech
405 satisfied customers
I have a problem with my motor mercury 2004 25 hp tiller
hello,I have a problem with my motor mercury 2004 25 hp tiller mount 4 stroke. my … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
2017 mercury 225 on a bass boat. went into reverse coming
2017 mercury 225 on a bass boat. went into reverse coming off of trailer and wont shift to neutral or forward, stuck in reverse position. any ideas? … read more
Jason
Jason
Marine Mechanic
17,010 satisfied customers
It's Bill Wurster - Greater Philadelphia Search and Rescue.
Hi Jason, it's Bill Wurster - Greater Philadelphia Search and Rescue.This is a followup from a year ago.50 HP HONDA BF50LRTA s/n etc: BBEJ‐1003015 BF50LRTA 651950, 04/2008 Fuel InjectedHad this proble… read more
Boat Doc
Boat Doc
205 satisfied customers
I was considering getting a Raymarine Axiom 7 for my
I was considering getting a Raymarine Axiom 7 for my sailboat. … read more
Boat Doc
Boat Doc
205 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x