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Subject Topic: 12v Electrics not working on main hook up
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Message posted by campgraham on 25/9/2014 at 8:00am
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Hi, I have an eldis 97 Jetstream. it has a new battery, on arrival to site I hooked up the mains and switched to caravan icon. the battery levels were on full on meter. After a day or so the battery meter went to zero, I think I may have left fridge on 12v supply by mistake. Now even when hooked to mains half the items work in the van and half don't? strip lights, electric fan heater have stopped working but 2 lights and all electric sockets are working fine? For some reason the mains hook up is not charging the battery anymore? Also some items are not working even when hooked up.

Does anyone know if it is possible for half the items not to work when plugged to mains if battery was to go so flat? Im thinking the problem lies with the on board caravan charger? if this I possible?

if the on board caravan charger was broken, would this stop some items in the van from working?

When I leave everything off for a while the strip light are coming on but very very dim so im guessing not a circuit problem.

really hope ome one can help me and thankyou in advance. all fue checked and as I say omtimes light dim so not a circuit problem as far as I can see.

pulling my hair out :/


Message posted by Ludovine on 25/9/2014 at 10:35am
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The fridge only works on 12v from car battery when towing so thats nothing to do with it. If all the 230v sockets are working when hooked up but battery has gone flat & 12v not working then yes, suspect faulty transformer/charger, new ones 70 upwards depending on type. You need to do a bit of fault finding with a multimeter but easy enough to check if battery is receiving no charge while on mains hookup.

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Message posted by madasaman on 25/9/2014 at 10:38am
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fridge on 12v won't make any difference, fridge will only operate on 12v when connected to the car and the engine is running. As to the two lights and electric sockets, are they mains powered? Have you checked all the fuses relating to the 12 v system.

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Message posted by Jax365 on 25/9/2014 at 10:40am
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Does anyone know if it is possible for half the items not to work when plugged to mains if battery was to go so flat? Im thinking the problem lies with the on board caravan charger? if this I possible?

The lights and the water pump are usually on the 12v circuit and won't work if the battery is flat. Take off the battery and give it a good charge with a battery charger, then try again with EHU.

I don't think it's possible to run the fridge on 12v when not attached to the car, it's only for travelling and keeping the fridge temp low.

The onboard chargers quite often aren't up to the job, especially at this time of year when you are using the lights, etc. a lot more because it's going dark earlier. But this shouldn't affect any three pin electric sockets, they will only work when plugged into EHU.

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Message posted by campgraham on 25/9/2014 at 4:46pm
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Quote: Originally posted by madasaman on 25/9/2014
fridge on 12v won't make any difference, fridge will only operate on 12v when connected to the car and the engine is running. As to the two lights and electric sockets, are they mains powered? Have you checked all the fuses relating to the 12 v system.


Hi many thanks for replies been big help. im assuming the sockets are running on 230v as these still work. the problem im having is half thing are still not running even though im plugged into a mains supply. I thought this would over ride the battery and make everything work ok when plugged in. im guessing this isn't the case once battery has gone so flat or charging unit is faulty. the light that are not working are trying to turn on as very dim if I leave the van using nothing for a while. thanks in advance for your advice :)

Message posted by HEJC72 on 25/9/2014 at 5:16pm
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Plugging into EHU will only power your 230v mains powered items - it has nothing to do with your 12v system unless you have a charger unit fitted that will charge your battery whilst on hook up.
All your 12v items run off your battery. If that is flat or you have a faulty charger then you will have mains power through your hook up but no 12v power.

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Message posted by campgraham on 25/9/2014 at 5:25pm
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I thought all caravans have 12v charger. so am I wrong in thinking once i plug my caravan in this charges my battery so makes all my electrics work constantly?

are you saying as there on 12v no matter what i do i have to keep charging the battery? i thought the electric hook up automatically keep my battery full and in turn allows my 12v circuit to constantly work?

Message posted by Ludovine on 25/9/2014 at 6:21pm
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You cannot generalise with caravan electrics, particularly on older caravans, also electrics could have been changed/bodged. Most caravans will have transformer/charger, if everything is working ok when plugged ito mains then 12v bits like taps & lights should work from transformer. Some will do this without a battery in the circuit, some will not but plugged into mains everything should work even if battery will not hold a charge.

Has caravan actually got a transformer/charger fitted? it could have been removed & battery charging relys on car while towing & separate charger plugged into mains, ie a bodge job.

First thing to check with caravan plugged into mains is voltage across battery terminals. There may be an inline fuse in battery cable, check this fuse is ok. Battery should be above 13v, if it is down to about 11volts it is dead & receiving no charge so then as I said before suspect faulty transformer/charger, if one is fitted.

To get yourself out of trouble you could charge your battery with separate charger plugged into mains socket in caravan then your 12v side should work.



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Message posted by freeatlast on 25/9/2014 at 6:55pm
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Many caravan chargers will not charge a totally flat battery, which would have drained fully if you left it switched to the fridge. This could also cause all the 12v side to stop working.

The only way to try and recover the battery is to use a smart charger. These will usually bring the battery back to life.

Message posted by Ludovine on 25/9/2014 at 7:20pm
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Caravan fridges are not connected to caravan battery, they only work on 12v from car battery when towing as 2 posters have previously pointed out.

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Message posted by 664DaveS on 25/9/2014 at 7:28pm
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Some vans have a changeover switch which selects car or carvavan. In the wrng place (car) ,no 12V supply is operating.
Worth getting a meter or if not sure someone who is competant with electrics to have a look.

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Message posted by Rob Johns on 25/9/2014 at 9:10pm
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We bought an older caravan earlier in the year and didn't realise that we had a problem because the first three trips were short weekend ones, also we condition the battery when the van is in storage with a 10 watt solar panel. However on a week long holiday, we realised that the 12 volt system was running low on voltage (it didn't help that I had left the awning light on all night!). I soon realised that the battery was not charging, so we popped off to a nearby caravan store and bought a new charger for around 90. Once in and connected, the 12 volt meter indicated 13.5 volts straight away and everything is now fine and the battery charges correctly. Most of the lights (all in our case) are 12 volts and the fridge only works on 12 volts when connected to your car and the car engine is running. I hope this helps.

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Message posted by old chap on 26/9/2014 at 1:49am
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leaving the fridge on 12v will not discharge the caravan battery as pointed out by others it only allows the fridge to work when hitched up to the car & engine is running usually there are 2 lights in the caravan & all the 3 pin plugs ,fridge (if set to 240) & the hot water heater that are operated only via the 240v hitch up. all the other lights & 2 pin sockets & caravan heater fan , TV Arial are 12v ( if the TV Arial is left on it will drain the battery)Usually the 12v system will work while you are on EHU even if there is a duff battery, but if the inline fuse to the battery is blown you will not get any 12v systems working,this fuse is usually inside the van just behind the battery box but could be any where in the line back to the electrical distribution /fuse boxbox.
to check if the battery is getting any supply from the charger connect a meter set to 12v across the battery terminals while on ehu ,this should show 13.8 volts DC if not the either the fuse is blown or the 12v power supply is faulty.
actually you state that the battery meter drops to zero this would indicate that the inline fuse is blown

Message posted by arry van-pulla on 26/9/2014 at 3:32pm
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Have you tried connecting up to the car with the engine running? It should show you if it is charging the caravan battery.

Message posted by Mrleejw on 02/9/2016 at 3:25am
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Hi all, firstly I want to thank ukcampsite.co.uk(this site) for letting me join .
So here is my post, secondly I'm liking this site already even thou I've just joined and visited right this second and read all these posts here on this page and in this subject inwhich I've searched for reasons all are talking about, after reading all posts it has gave me a lot of information and learned lots and thank you all for all this. I like to thank all for your posts genuinely as I am brand new at caravaning and wish you to know I have after 46 years life growing older by the day viewing people with caravans and I've been fascinated thru out my years, one day I said I will have a caravan and experience the life of owning myself one. Well I have recently bought one and as a beginner and first timer , I got a small 2 birth either 83 or 93 model lunar meteor. Cheap as chips and did have a little mould but assured it been sorted and seems to have. Well after me and wife completely cleaned inside and out and refitted a new carpet, we are amazed the thing now is immaculate thru out.
Anyway I'm slowly learning gaining info from everywhere on Internet and stumbled across this unique site. I'm impressed so far and thought I'd post this. So my questions are a few and here these posts have enlightened me some. But my question still is this.

I also like above got a flat batterie and recharged it with a car charger in house and batterie result is 100% and brand new. But I've recently fitted a all round entertainment system this is a 7inch screen with CD player /DVD/music/usb/micro card/Bluetooth/radio/tv/iPod/ etc and has connections for 2 cameras and aux, also output to 2 tv's and audio outputs etc. But it needs permenant live to keep memory for everything including time and date , tv progs, radio stations etc etc. Well after getting it working great I turned off the unit and next day batterie on caravan was killed. 😭
I thought right plug caravan in to 240 and batterie should recharge , but it only got to half charge on indicator and seemed it would go any more , so I recharged fully using car charger in house again to full. This is when I thought looking at the big unit in caravan ie what All here is posting about ie the 12v /240v unit with 12v fuses on right bottom and left top corner 240v fuses I assumed that this is what everyone here is posting about. I gather this unit acts as a safety inline fuse box and if I'm correct should act as a charger for the batterie I am charging in house ie like a car batterie .
Well as said after reading above all posts I have come to doing the following
1. Check all fuses on unit then
2. Whilst I connect caravan up to 240v (question here:- should I take batterie off and check the batterie connections with volt meter to see if there is charge coming from the caravans unit as if charging so should show 13v).
3. If charge showing then okay and leave batterie on longer to charge fully. if not as above comments unit faulty and needs new or mending.

These are the things at the moment I need to address to continue my quest of the rest of the things in caravan.

I've checked gas all okay , cooker works and heater works. All water works hot and cold.

Next is fridge thou and what I've read above only works via car, which I thought it would work off batterie .

Next is I've got two connecting plugs in front to car towing and some how get both black and grey plugs to connect , I've bought a splitter lead but goes to a thirteen pin connect up not seven , so I have a few things yet to learn.

Thanks all if you managed to get thru all this post of mine and giving the time to do so.

Thank you all again for your time

Yours

Mr lee j Wood

Message posted by Mrleejw on 02/9/2016 at 3:42am
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Hi again here is the unit I mentioned about and I thought you all would be interested in to maybe buy for your caravan and as I am going to use this and connect it to my big tv and use both , as the unit itself I've fitted two 300 watt car speakers that has 4 way speakers on them that is bass/med bass/mid range/tweeter. So has fantastic sound to all the unit does , also you may even connect cameras on it so you can view all outside you caravan whilst sat comfortably and not move lol. Anyway unit is on eBay and hope you can find it
Here is title to search it on ebay

https://www.ebay.co.uk/itm/302020912624 https://www.ebay.co.uk/itm/302020912624

Yours mr l j wood


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