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Martins889

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Reply with quote  #1 
This winter my 2013 Ducato based Adria motor home has a higher than previous standby battery draw which runs the starting battery flat. The draw seems to be around 100 to 150 ma, although, occasionally, I do get the expected good draw of 6 to 10 ma. The draw seems to be through fuse F23 which is annotated in the handbook as ABS solenoid valve. In previous years I could leave the van for 5 or 6 weeks and it would start just fine. This year I can only leave it a few days.

has anyone any ideas about how to track the problem down further? Does anyone know where I could find a readable wiring diagram with F23 on it?
any other suggestions?
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BurtSner

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Reply with quote  #2 

Welcome onboard Martin.

Sorry I can’t help too much in this area, although it seems strange that you’re getting a change in the system that has previously been OK . I assume you’ve not added or changed anything electrical recently?  

To be honest though, I’m not a fan of Fiat electrics as I also had an issue a year or so ago when I was getting steering problems, we believe it was down to a dodgy connection on a sensor block. Our solution, not planned as such, was to unplug and reconnect the steering relay and sensors looking for a problem, couldn’t find anything and suddenly the problem disappeared. 

I can only offer the suggestion to remove and refit anything that maybe in the region of the ABS valve or relays - and even the fuse is worth a look. 

if and when you do get it sorted please let us know, and then you can tell us a bit more about you and your MH travels, and other likes - like motorbikes 😂   I saw you mentioned them -pictures are worth plenty of looks  👍




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Burstner Nexxo T660 - family fun
1974 Norton Commando
1999 Suzuki Hayabusa
2000 Honda Blackbird
Molly - Chocolate Labrador 
only a biker understands why a dog hangs its head out of the window
Exeter, East Devon

Simon
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SANDBAGSID

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Reply with quote  #3 
Welcome Martin, can’t really offer a reason for this problem. I would charge the battery fully then remove the f23 fuse and see what the battery reads after a few days that way you could at least be sure it is a good possibility it’s the abs thats flattening you’re battery. Worth a try.
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rayc

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Reply with quote  #4 

"The M051 braking system control unit is supplied directly from the battery, at pin 2 for the electronics and pin 3 for the solenoids, via lines protected respectively by fuses F1 and F23 of engine compartment junction unit B001."

I have attached a pdf of the ABS system. I hope you are able to open it as some devices have difficulty. 

 
Attached Files
pdf ABS.pdf (339.94 KB, 8 views)

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BurtSner

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Reply with quote  #5 
That’s super Ray, opens fine for me on t’ipad 
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Burstner Nexxo T660 - family fun
1974 Norton Commando
1999 Suzuki Hayabusa
2000 Honda Blackbird
Molly - Chocolate Labrador 
only a biker understands why a dog hangs its head out of the window
Exeter, East Devon

Simon
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rayc

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Reply with quote  #6 
The pdf wiring diagram was a bit fuzzy so here is a picture showing that F23 goes directly to the ABS Control Unit.
F23 appears to be the power for the solenoids, perhaps one of them is holding On when it should be off??

F23 is not ignition controlled so it appears to feed the ABS unit all the time??

That is about as much as I understand about the ABS.

Attached Images
jpeg ABS wiring.jpg (101.64 KB, 15 views)

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Martins889

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Reply with quote  #7 
Thanks guys for your comments. I can read the pdf file and picture fine, although not sure it helps much. Having a break from worrying about the issue for a bit, but will post again if I get anywhere. For the time being I will circumvent the problem by either leaving the mains power connected (so the battery is charging) when I can or leaving a small solar panel (10W) connected to the battery to, at least, replace some of the charge. Can anyone enlighten me about where the MO51 unit is physically situated in the van?
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rayc

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Reply with quote  #8 
Quote:
Originally Posted by Martins889
Can anyone enlighten me about where the MO51 unit is physically situated in the van?


Refer to the last page of the pdf. It is on the bulkhead in the engine bay on the [UK] nearside [below the diesel filter].
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Martins889

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Reply with quote  #9 

Soty rayc, I am being dim. Did not look further than the wiring diagram in the pdf. 

Went out to measure the draw again this morning. Lo and behold it was down at 6 to 10 ma as it should be! Not really sure what to do now, but will probably just live with it and monitor it from time to time.

Difficulty is that it is not an easy parameter to measure regularly. My current method is:

leave the van for a while to let the electronics stop twittering to each other.
then remove the mat and remove the battery cover.
Connect a multimeter on 300ma range in parallel with the bolt link in the Earth battery connector.
Undo the bolt link and lift the link off being very careful not to disturb the parallel connection through the meter.
Read the meter.

However I have permanently connected an LCD voltmeter module to the battery. It only draws about 1 ma itself. This will allow me to continuously monitor the battery voltage.


Thanks for your help.

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BurtSner

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Reply with quote  #10 

Quite often just talking about something seems to cure Fiat electrics 😂.  

I’ve wondered for a while about some “issues” with my solar and the monitoring mechanism, and yet despite this being the unsunny time of year my battery banks don’t plead to suffer. I’m positive, I think, that the battery monitor lies. I’ll tolerate it for now. 

thanks for coming back to us to let us know how you’re getting on. 


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Burstner Nexxo T660 - family fun
1974 Norton Commando
1999 Suzuki Hayabusa
2000 Honda Blackbird
Molly - Chocolate Labrador 
only a biker understands why a dog hangs its head out of the window
Exeter, East Devon

Simon
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rayc

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Reply with quote  #11 
A quick google of " ABS unit parasitic battery drain" gives a multitude of hits. I haven't read them in detail but it appears the unit may continue to operate for some time after switching the ignition off.
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powerplus

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Reply with quote  #12 
hi all

i was playing with the older hobby van that i have got hold of to play with


 i was looking into why the engine battery did not get any charge it looks as if the toptron controller that hobby used has a fault everything else works 

i wanted to check if the solar was working ok and it was i switched the power off and switched on some internal lights

and the solar controller showed the solar panel was producing  2A which is pretty good for a 100 to 120w panel and not a bright morning

what i am getting at is i would have thought that a van with 100w solar should be able to overcome parasitic loads even with the bad weather that we have recently had


barry







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