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Post by sitara on Oct 12, 2013 21:17:55 GMT
Hi All,
I discovered yesterday that I have some wiring issues with the house and start batteries. I normally switch on the house master switch first for instruments etc and then the start battery switch when I want to start the engine. And then use the reverse procedure when leaving the boat. Yesterday I switched off the house master switch while leaving the start battery switched on. To my surprise the house circuits remained energised - lights still worked, fridge worked, water pump worked. I assume this means that the start battery is connected into the house circuits and is in danger of being inadvertently discharged loosing the ability to start the motor? At least I am not able to start the motor with the start master switch off!
Has anyone else had a similar problem? or pointers on what to look for. I have not started to trace the fault yet - fun for the next trip to the boat.
Rob
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Post by aussieodyssey on Oct 13, 2013 18:06:39 GMT
Hi Sitara How do you charge your batteries ? Battery combining relay voltage dependant relay ?? One of these could of failed !!!!  Regards Greg |
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chaika
Junior Member
Posts: 20 
Country: Tasmania, Australia
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Post by chaika on Oct 13, 2013 21:39:28 GMT
Hi Sitara,
When installing the lithium system on my 36i I noticed that the wiring diagram in the 36i manual did not match the actual wiring. I corrected wiring. The error would result in the exact problem you have discovered. I can forward my marked up version of the electrical wiring diagram from the 36i manual.
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Post by sitara on Oct 13, 2013 23:48:44 GMT
Greg,
The boat has the standard Cristec battery isolator as supplied by Jeanneau. and batteries are charged either by shore power (Cristec charger) or from the alternator. I have just looked at the isolator manual and it says "When DC-power is available from the Battery charger / Alternator, the green LED on top 01 the Battery Isolator illuminates".
I am pretty sure that this LED is on when both switches are on and the charger/alternator are off.
Chaika,
Does your marked up wiring diagram show the error you found? I do have the wiring diagram in the manual but have not started to check out how it corresponds to the boat wiring. That is, other than to note that the connections to the Shrieber volt meter do not correspond to the manual.
Thanks, Rob
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chaika
Junior Member
Posts: 20
Country: Tasmania, Australia
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Post by chaika on Oct 14, 2013 0:01:17 GMT
Rob,
Marked up diagram shows the error. I can email if you post a message to me with your email address.
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Post by MalcolmP on Oct 14, 2013 8:02:38 GMT
Rob, Marked up diagram shows the error. I can email if you post a message to me with your email address. Please do send me a copy as well to webcrew@jeanneau-owners.com I will put a warning note on the main website, sounds like something that others should check and may not be limited to the 36i If you have a photo of the wrong and corrected wiring that would be even better Many thanks Malcolm |
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Post by j on Oct 14, 2013 10:02:55 GMT
Checked this out today, we don't have the same problem (Dec 2008 36i)
No matter what order the switches were turned on or off the only way for power to get to the switchboard and all house stuff is if the red house switch is on.
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Post by allegria on Oct 15, 2013 1:20:11 GMT
Hi Sitara,
I have a 36i from 2010 and do not have that issue.
I would check the Voltage Sensitive Relay (VSR) as suggested in a previous post.
I had a good look around with a marine electrician recently to add a smart regulator and the diagram corresponded to the installation.
Apologies if I state the obvious here but the VSR will connect both banks in parallel when the engine is running and pumping some amps from the alternator. This is to allow the charging of both banks.
Although, instinctively, you would think a failure would leave the circuit open, it might be possible that the VSR is stuck closing the circuit.
I assume the engine was not running when you noticed this issue, if it was, then you have the answer to your question and the behaviour would be expected.
Good luck with that and keep us posted.
Cheers,
Allegria
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Post by krawall on Oct 15, 2013 2:03:47 GMT
Hi,
I had a similar problem that nothing would turn off even I turned off the negative (ground). Turns out I had a rechargeable torch plugged in which would feed power back into the circuit if the the main switches were off.
Took me LONG time to figure out.
Tom
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Post by sitara on Oct 16, 2013 4:35:25 GMT
As suggested by Chaika I found that the boat wiring differed from the circuit diagram in the manual. My boat is equipped with a Cristec battery isolator. The supply lead from the isolator for the house batteries is shown on the circuit diagram as attaching to the battery side of the positive master house switch. In the boat it was attached to the house side of that switch. This meant that the house batteries would not charge from the alternator if the house master switch was off. It also meant that current could flow from the isolator bypassing the the house master switch as it was doing when the engine switch was on. I moved the supply lead from from the house side to the battery side of the house switch and this cured the symptom (ie when the house switch is off and the engine switch is on there is now no power to the house circuits).
This still leaves the question as to why there was a current flow through the isolator in the first place? I assumed that there should be no current flow as the isolator should prevent it. Unless the isolator prevents flow only at a less that fully charged voltage or unless the isolator is faulty. Time to call in the experts I think.
Rob
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Post by MalcolmP on Oct 16, 2013 8:22:17 GMT
Rob, Marked up diagram shows the error. I can email if you post a message to me with your email address. Please do send me a copy as well to webcrew@jeanneau-owners.com I will put a warning note on the main website, sounds like something that others should check and may not be limited to the 36i If you have a photo of the wrong and corrected wiring that would be even better Many thanks Malcolm Attachments:WiringAnomoly.pdf (108.34 KB)
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Post by sitara on Oct 16, 2013 21:01:29 GMT
This is great Malcolm, exactly what I had/have on my boat.
Rob
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Post by MalcolmP on Oct 16, 2013 21:50:33 GMT
This is great Malcolm, exactly what I had/have on my boat. Rob Rob - I am just the messenger here, the drawing is from Chaika - but I love getting credit even if I don't deserve it ;-) |
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Post by sitara on Dec 8, 2013 22:00:59 GMT
End of the saga - our local marine electrics expert confirmed that it looked like a faulty isolator and a replacement isolator was duly supplied by Jeanneau. The new isolator was fitted and the fault persisted! We eventually found that a wire connecting the alternator to the starter motor had not been removed as specified in the Cristec isolator installation instructions in the factory installation. This wire was buried in the wiring loom and not that obvious.
The switch panel voltmeter now gives significantly different readings on house and engine batteries. Perviously the differences were small and I had even wondered if there was a voltmeter fault.
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