The Caravan Owners Club

[tra751t]

Looking to buy ASAP if poss the following:-

Dometic transformer model no:- con2145100 , product no 9910035-05

as mine blew up on saturday leaving me only 24v via the plug sockets.

no lights or pumps working at the mo

any help welcomed

Slippy....

[Roy Armstrong]

They are expensive but if you follow this link you can fit a leisure battery and charger instead.

http://www.thecaravanownersclub.co.uk/f ... php?t=1124

[tra751t]

Many thanks,

Interesting thats for sure, Yeh i just got quotted £270 for the part that i need from a hobby dealer up here in sunny scotland.

I bought this van 2 years ago, It came with a leisure battery & charger that was meant to power my 12v lights but it never worked for some reason , i know the 12v battery & charger works as my motor mover & tracker etc still works but no 12v lights etc ???

I did wonder before my Dometic blew up how to fix the liesure battery problem so i didnt have to run my electric from a Genny but i never got round to it.

Now when the Dometic blew i did wonder if i just could bypass all of it to gain 12v power but as i know very little about electrics i thought it would be easier just to buy a new one...

The person who is selling it advised me that they dont stock my particular Dometic model number anymore as they only have newer versions but this should still work ok and is easy to wire up

Phew! i hope hes right, I saw pics on this forum but it still left me puzzuled, hopefully 1 goes to 1 & 2 goes to 2 etc

Keep you all posted

Slippy

[Roy Armstrong]

Looking at your pic., the reason that your battery is not powering the caravan is that it is not connected to the Dometic.

Just unplug the mains from the Dometic, remove the black and the white cables from the terminals next to the mains connector and connect the battery to the vacated terminals.
Positive to where the black came from (Batt+) via a 20 amp in line fuse and negative to the other terminal.

This leaves all the Dometic fuses in operation.

See my 2 Hobby electrics pics on Page 6 of the gallery.

Save £270.00!!!!!

[tra751t]

ROY , ROY , ROY !!!!

Thank you Sir, YOU ARE THE MAN !! Thats about £270 worth of beer I am due you ....

Thanks for the advice, The 12v Battery was actually wired up correctly I think, The red wire from the battery went into the terminal that you said, however I noticed that there was this orange plastic sealed 3 Amp fuse connected on the BLUE wire coming from the battery - going to the on/off switch that controls the 12v system somehow?

The 3 AMP fuse looked pretty corroded and as it was sealed i could not see it so i removed the fuse and connected the 2 spade terminals together and everything came back on or so it seems.

All I need to do now is just charge up my battery now and again & everything should be ok (( am i correct?))

I will obviously also need to fit a new 3amp fuse (( am i correct?))

May I take this chance to pick your brains about this ONE red light i now have on under the blue fuses, I have changed the fuse over but still the light comes on , even although i think everything is back up working....... is this right do you think & any more pointers ??

Thanks Again Roy

Slippy

[tra751t]

** SLIGHT UPDATE **
I forgot to remove the black and the white cables from the terminals next to the mains connector but i have done this now, It had masking tape with "BATT" wrote on it.

However i still have the wee red light on, I guess thats because the Dometic is actually faulty ????

Thanks for any pointers again

Slippy...

[Roy Armstrong]

The red light normally indicates that the fuse above it is faulty.

The reason that I believed that the battery wasn't connected to the Dometic was that the mains connector was still in use and should not be, unless the other end of the mains cable had been disconnected.

A 3 amp fuse does not seem to be man enough if it is in the circuit that runs the water pump, loo flush pump and all the lighting.
Check by removing this fuse and if it stops the above functions, then increase it to 15/20 amps.
If the battery is charged and removing the 3 amp fuse still allows the above functions to work, then it is probably just in the charging circuit.

NB if your battery is flat, then the charger may be providing the 12 volts rather than the battery and the 3 amp fuse would blow if lights and pumps were used together, so fully charge your battery before doing the above checks.

The black and white cables that you have removed come from the distribution box under the front seat which in turn come from pin 13 (earth) and pin 9 (12 +ve) of the 13 pin car connector, if you are still using this rather than 7N & 7S plugs.
The purpose was to allow the interior lights and pumps to operate from the car battery when not on EHU.
This is not necessary with an on-board battery.

The black and white leads can be used to charge the on-board battery from the car whilst travelling but this requires a circuit using two relays.

I do have a schematic that I could e-mail to you if you PM me your e-mail address, should you need this facility.

EDIT. I've just noticed in your pics above that the green light seems to be lit, unless it is due to camera flash. This light should only be lit when there is 230AC to the Dometic but leave the Dometic switch to OFF permanently.

Cheers and good luck......you will get there!

Roy

[andy720ukfe]

hi roy
just woundered why you unplug the mains lead from the dometic transformer you can leave it in because there is a relay inside, that isolates batt+ when the mains is connected !
this means your battery is only used when theres no 230v coming into the van,
your battery will be charged up by your mains charger from 230v

[Roy Armstrong]

Quite a number of these Dometic units have been failing and I felt it better to do away with the Dometic facility but retain the use of the fuses in that unit.

This unit was replaced by Dometic quite quickly in it's life cycle by a new model but I have no knowledge of whether the new one is any better.

I used the mains connector to power my charger.

[tra751t]

Thanks for all the help , I hope it can help others too.

Just a wee update and that is , I have came home this morning to find the green light has now vanished ( good thing i think ) , the red light above the fuse is still on ( not a good thing i think ) & i have also discovered that the outside light & the set of rope lights round the main seating area are not coming on either. Maybe this may explain the red light?

Anyhoo , I am just going to bite the bullet & buy a new dometic anyway , I feel, I have everything important back up working the now thanks to Roy & he has even managed to help me fix my leisure problem too ! , I am going put a bigger fuse in that blue wire & wire up my new dometic when i get one hopefully next week , so by no means is this thread finished yet......

Watch this space

Slippy.

[Roy Armstrong]

If you want to be really cute and save £270, you could take the connector off +1 and connect it to any spare terminal on +2 or +3 or +4.

From your pic there seems to be a spare on +4.

You will possibly need to increase the value of the associated fuse.