You are logged in as a guest. 
  Home Forums Home  Search our Forums Search our Forums    Log in to the Forums Log in to the Forums  register Register on the Forums  

 Forums ->  Motorhomes -> Motorhome Matters
Jump to page : First 1 2 Last
Format:  Go
RM7655L fridge not working on 12v
AuthorMessage
userHymer fan
Posted: 2 October 2021 4:23 PM
Subject: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
I hope someone out there can help
My tec Tower fridge will not work on 12 v
Had the hymer b544sl 2009 about 12months
Fridge worked OK when I got it
Checked the back of the fridge with a Multimeter
And found no power to the heating element wire
Also no signal on the D+wire
Checked the permanent live behind the control panel on the fridge
Got 12v but no D+signal at the connector block
At the starter battery there is a 50amp fuse and a 2amp fuse
What I can't understand is the 2amp fuse is connected to the starter battery
Been in touch with udo lang & he said there is a 20amp fuse next to the starter battery
But I have looked all over but cannot find any 20amp fuse
Everything was pointing towards the electroblock 101 so sent it to apuljack
Came back as no problem found
So I am a bit flummoxed as to where to go from here

Thanks in anticipation
user747
Posted: 2 October 2021 4:49 PM
Subject: RE: RM7655L fridge not working on 12v
 


Forum master

Posts: 2812
2000500100100100
Location: Tyne and Wear - Burstner Delphin Performance T821


Did you have the engine running when you checked for a 12 volt supply at the fridge?

There should be a wiring diagram online if you search. It could be possibly be a failed relay which puts power to the fridge and is normally fitted near the engine (don't know about an A class).

As the EBL has been cleared then try removing the lower fridge vent to check the connections there.

usercolin
Posted: 2 October 2021 4:55 PM
Subject: RE: RM7655L fridge not working on 12v
 


Legendary contributor

Posts: 8915
500020001000500100100100100
Location: Bedfordshire, Globecar 636SB


747 - 2021-10-02 4:49 PM

Did you have the engine running when you checked for a 12 volt supply at the fridge?


And the 12v turned on at main control panel, not just the fridge.
userHymer fan
Posted: 2 October 2021 5:31 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi yes checked with engine running
Also checked connections at rear of fridge
Can't find a relay in the engine compartment
Do you meen in the engine fuse box
userHymer fan
Posted: 2 October 2021 5:32 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi yes electroblock switched on
userbuddy
Posted: 2 October 2021 5:46 PM
Subject: RE: RM7655L fridge not working on 12v
 
Keeps coming back for more

Posts: 161
1002525
Location: West Sussex Autocruise Rhythm 2015


There may be a small unit marked PLT02 near the EBL that has a 20 amp fuse in it that is for the fridge.
There is a download for the EBL119 at www.aandcaravanservices.co.uk in the Schaudt Elektroblock section that may help if you do not have it as it shows the connections to it ,including the D+ from the engine.
I think you will find that the relays for the fridge etc are inside the EBL119 which has been declared ok

Edited by buddy 2021-10-02 5:50 PM
userBrian Kirby
Posted: 2 October 2021 7:00 PM
Subject: RE: RM7655L fridge not working on 12v
 


500050005000200020005002525
Location: East Sussex. Motorhome: Knaus Boxstar 600 Street


buddy - 2021-10-02 5:46 PM

There may be a small unit marked PLT02 near the EBL that has a 20 amp fuse in it that is for the fridge.
There is a download for the EBL119 at www.aandcaravanservices.co.uk in the Schaudt Elektroblock section that may help if you do not have it as it shows the connections to it ,including the D+ from the engine.
I think you will find that the relays for the fridge etc are inside the EBL119 which has been declared ok

Apologies, but the above link should read http://www.aandncaravanservices.co.uk/ .
userHymer fan
Posted: 2 October 2021 7:05 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
There is no other unit near the electroblock
On my van the unit is in a compartment under the double floor
Next to the leasure battery
userbuddy
Posted: 2 October 2021 7:18 PM
Subject: RE: RM7655L fridge not working on 12v
 
Keeps coming back for more

Posts: 161
1002525
Location: West Sussex Autocruise Rhythm 2015


Thanks for correcting the link Brian , hopefully it may be useful in locating the problem of the missing D+ signal

Edited by buddy 2021-10-02 7:24 PM
userHymer fan
Posted: 3 October 2021 11:05 AM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Yes will have to trace the D+signal wire from the alternator
The alternator is in a very awkward place
Cannot see it from above so will have to crawl underneath
Does the D+signal wire go straight to the electroblock
& is the heater element wire connected to the electroblock
Because udo lang says check the 20amp fuse near the starter battery
But there isn't one anybody got any idea where this might be
userKeithl
Posted: 3 October 2021 11:12 AM
Subject: RE: RM7655L fridge not working on 12v
 


Lord of the posts

Posts: 5989
5000500100100100100252525
Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.


Is your 2009 Hymer built on a Ducato chassis? If so does it have the small body builders connection point located at the base of the 'B' pillar just behind the drivers seat? From previous comments it may be hidden behind a secret panel!

Keith.
userbuddy
Posted: 3 October 2021 11:48 AM
Subject: RE: RM7655L fridge not working on 12v
 
Keeps coming back for more

Posts: 161
1002525
Location: West Sussex Autocruise Rhythm 2015


Check the 20amp fuses that are on there own on the far left of the fuses on the EBL also the one marked reserve 4 is sometimes used for the fridge.
The D+ goes in to the EBL at Block 2 (pin 3) via a 2 amp fuse according to the wiring diagram for the EBL 119 .


Edited by buddy 2021-10-03 11:53 AM
userHymer fan
Posted: 3 October 2021 8:09 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi Keith
No it is a ALKO Chassis
I have not noticed a panel but will have a look
Next time at the storage
userHymer fan
Posted: 3 October 2021 8:20 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi buddy
I have checked all the fuses all OK
On the EBL 101 the D+wire is on block 2 pin3 so the same
Didn't know reserve 4 was used for fridge
Learn something new every day
Thanks buddy will double check
userKeithl
Posted: 3 October 2021 8:36 PM
Subject: RE: RM7655L fridge not working on 12v
 


Lord of the posts

Posts: 5989
5000500100100100100252525
Location: Birmingham. 2004 Auto-Trail Cheyenne Mercedes 313.


Hymer fan - 2021-10-03 8:09 PM

Hi Keith
No it is a ALKO Chassis
I have not noticed a panel but will have a look
Next time at the storage

It may be an ALKO rear chassis but the forward section will still be Ducato and should have the 'hidden' body builders connection point just behind the drivers seat.

Keith.
userbuddy
Posted: 3 October 2021 9:10 PM
Subject: RE: RM7655L fridge not working on 12v
 
Keeps coming back for more

Posts: 161
1002525
Location: West Sussex Autocruise Rhythm 2015


There is also a feed from the starter battery into the EBL for the fridge to pin 1 block 2 via a 20amp fuse which makes me think that there are a pair of fuses (2amp + 20amp) somewhere , sorry ,but I cannot help with the location.
Are you able to check the readings at the block 2 pins (engine running) to confirm that the D+ signal is not reaching the EBL at this point before trying to locate these fuses.?


Edited by buddy 2021-10-03 9:12 PM
userHymer fan
Posted: 3 October 2021 10:19 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi buddy
At the starter battery there is a 50amp fuse & a 2amp fuse the 2 amp fuse is connected to the
Starter battery have tried to trace this cable but from the battery it goes under the rubber matting
& cannot trace without taking the seat out and the rubber floor up
There is no 20amp fuse near to the battery cannot find this
userHymer fan
Posted: 6 October 2021 5:27 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
Had another look at the wiring today
Can anybody tell me if you can wire an electroblock 101 up differently for the fridge
Looking at the wiring diagram for EBL is
Block 2pin5 live engine not running
Block 2 pin4 live engine not running
All the others no power
Even with engine running
Still not found 20amp fuse
Tried to trace D+signal wire from alternator
But lost it when it went into the harness
Will try to send photo
userHymer fan
Posted: 6 October 2021 5:45 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Had to keep cropping the photo to make it fit
userHymer fan
Posted: 6 October 2021 5:48 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Had to keep cropping the photo to make it fit
Will not send will try later
Will not crop down far enough
Smallest I can get it is 556kb

Edited by Hymer fan 2021-10-06 5:52 PM
userDerek Uzzell
Posted: 6 October 2021 6:59 PM
Subject: RE: RM7655L fridge not working on 12v
 


500050005000500010002525
Location: MODERATOR - 2015 Rapido 640F LHD 2.3ltr 150bhp


I use this website for resizing

https://www.reduceimages.com/
userHymer fan
Posted: 6 October 2021 9:49 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
Thanks Derek
Will try it
userHymer fan
Posted: 6 October 2021 9:52 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
Thanks Derek
Will try it



(IMG_20211006_174030.jpg)



Attachments
----------------
Attachments IMG_20211006_174030.jpg (95KB - 24 downloads)
userAlanb
Posted: 7 October 2021 10:41 AM
Subject: RE: RM7655L fridge not working on 12v
 
Epic contributor

Posts: 1182
1000100252525
Location: North Yorkshire


Hymer fan - 2021-10-06 5:27 PM

Hi
Had another look at the wiring today
Can anybody tell me if you can wire an electroblock 101 up differently for the fridge
Looking at the wiring diagram for EBL is
Block 2pin5 live engine not running
Block 2 pin4 LIVE engine not running
All the others no power
Even with engine running
Still not found 20amp fuse
Tried to trace D+signal wire from alternator
But lost it when it went into the harness
Will try to send photo


I am looking at a diagram for "EBL 101 C" dated 30-09-2008.

If all connections are as shown in the diagram, BL2/4 (Block 2 pin 4) should never be live. It is the starter battery negative for the fridge, and is only connected internally to BL1/3, fridge -ve.

The fridge element +ve should be connected to BL1/1, or BL1/4 which are linked within the EBL (Electroblock).

The fridge D+ should be connected to BL1/2.

If the above three of the above BL1 are populated, then it is reasonable to assume that the fridge is connected in accordance with the diagram.

As suggested by buddy, it is possible that an AES fridge could be connected elswhere, and provided that it has the missing D+ connection, will function normally. With this configuration alternator charging of the habitation battery will suffer due to the extra voltage drops in the main (50 A) fuse, cable, and the split charge relay.

The EBL drawing calls for three connections with appropriate fuses at the starter battery. A 50A connection for charging the habitation battery from the alternator, a (not found) 20A connection for the fridge, and 2A for starter battery sensing. (Function queried by OP.)

The fact that BL2/4 appears to be live, suggests a missing -ve connection for the fridge. However there seem to be missing +ve supplies as well.

If the vehicle is operated on EHU, it seems possible to me that habitation system could function without a connection to the starter battery. It may well be worth checking connections at the converters panel.

I have warned about misleading readings given by very sensitive modern multimeters in previous threads. Such meters can give a plausible reading via a relatively high resistance. A simple 12V test lamp is often a more certain indicator of the presence of a 12V supply.

Alan

userHymer fan
Posted: 7 October 2021 7:21 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi Alan
I cannot understand why it would be wired up wrongly
Looks like I will have to take the seat out to check the wiring to the electroblock
And make up a light tester
Thanks for your input
Will come back when I checked all the wires out
userAlanb
Posted: 7 October 2021 9:31 PM
Subject: RE: RM7655L fridge not working on 12v
 
Epic contributor

Posts: 1182
1000100252525
Location: North Yorkshire


Hymer fan - 2021-10-03 10:19 PM

Hi buddy
At the starter battery there is a 50amp fuse & a 2amp fuse the 2 amp fuse is connected to the
Starter battery have tried to trace this cable but from the battery it goes under the rubber matting
& cannot trace without taking the seat out and the rubber floor up
There is no 20amp fuse near to the battery cannot find this


Hymer Fan,

Sorry I missed your mention of the 50A fuse when I was scanning through the thread earlier today.
The presence of the 50A fuse at the starter battery suggests that your vehicle may not have a converters panel.

When you get access to the EBL, may I suggest that you start your tests by checking both starter battery and habitation battery power are present at the main terminals at the rear of the EBL, by testing between terminals. The middle terminal (2) is shown as being connected to habitation battery -ve, so presence of starter battery power here would suggest that the connection between both battery negatives is present, but also worth a physical check.

Alan
userAlanb
Posted: 8 October 2021 10:37 AM
Subject: RE: RM7655L fridge not working on 12v
 
Epic contributor

Posts: 1182
1000100252525
Location: North Yorkshire


Hymer Fan,

Missing D+ and 20A Fridge Fuse

I cannot see that you have confirmed/refuted that the base vehicle is in fact a Fiat Ducato. I will therefore assume that it is an x250 Fiat Ducato.

On this vehicle the D+ signal originates at the alternator as a yellow wire with a red stripe (Ye/Rd). There is a colour change to Bn/Gn at the "front engine connector" under the engine bay fusebox. The Bn/Gn wire terminates at pin A25 of the body computer. The body computer is directly coupled with the cab fusebox.

If a connection has been tapped into the basic D+ signal, it should logically be adjacent to the body computer.

The alternative D+ signal is from the converters panel as suggested by Keith, but the signal there is active low (connected to earth when engine running), and would need a relay module (relay in a box) to convert to active high (+12V) before connecting to the EBL.

The non visible 20A fuse makes me wonder whether your fridge has been connected as suggested previously by "buddy".

I could speculate further, but I think that your findings as to the location of wires on the EBL should come first.

Alan
userHymer fan
Posted: 8 October 2021 6:00 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
Thanks Alan not had chance to check everything yet
Will have to read your post a few times to get my head round it all
Will get back with my findings

Thanks again
userHymer fan
Posted: 13 October 2021 3:52 PM
Subject: RE: RM7655L fridge not working on 12v
 
Having a look around

Posts: 33
25


Hi
Just a update have still not been able to find where they have spliced in to get a D+signal
To the electroblock 101
Have checked the wire from the alternator all the way through to the body computer
& have power up to that point
Is it possible to splice into this wire and take it to the electroblock
Or does it go through the computer
If not
Would I need another relay before the electroblock
Also I have a AD01 box under the driver seat (no D+signal here either)
So the daytime running lights will not work
Is there a relay on the cab fuse box that has something to do with the D+signal wire
Thanks


Edited by Hymer fan 2021-10-13 4:04 PM
userbuddy
Posted: 13 October 2021 6:56 PM
Subject: RE: RM7655L fridge not working on 12v
 
Keeps coming back for more

Posts: 161
1002525
Location: West Sussex Autocruise Rhythm 2015


There are relays in the ADO1 adapter and D+ seems to be linked to it , if you google Schaudt ADO1 it brings up a PDF of a instruction manual at aandcaravanservices .resources. This includes the wiring in to / inside / and out of this unit showing D+ connections etc.
Sorry but do not know how to do a link ,

Edited by buddy 2021-10-13 7:19 PM
Jump to page : First 1 2 Last
Printer friendly version
E-mail a link to this thread
Jump to forum :


(Delete all cookies set by this site)(Return to Homepage)

Any problems? Contact the administrator