1994 Hymer fridge wiring

Discussion in 'Tech/Mech General' started by nunny666, May 13, 2014.

  1. nunny666

    nunny666

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    So this us how it started , bought hyma and fridge did not work on 240 v even though 240v switch worked , also would not work on gas , now the 12 v light came on as supposed to when engine was running , because the fridge was not working I purchased another electrolux fridge (different model), now when connecting the wires , I noticed the electronic ignition did not work on fridge , and the 12 v switch lights up without engine running , (could a relay be stool open ? ) now if I swap the wires over to the other pair , the gas electronic ignition works fine , but the 12 v switch light dies not come on , even when engine running , I know that hyma used blue & brown wires , blue been the live , one pair of the two seems thicker wire ( same colours ) ime guessing this would be the 12 v supply and the slightly smaller wires are the electronic ignition, I can here the on board charger running too , seems fine , now I was wondering on my 1994 Hymer b534 where the fridge relay is likely to be situated , in the dash of the fiat with the other relays and fuses , or internal in the blue charger box under seat where 240 v breaker is , the fridge works fine on 240 v , ( now if the relay can't be fixed or got at , would it be possible to join the two feeds together onto the two wires that have power , as not used at same time and will make sure the 12 v is only used when driving , ? In affect by passing a faulty relay , thanks in advance nunny
     
  2. nunny666

    nunny666

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    Sorry on my phone mean relay stuck open , and when I say under the seat I mean under the u shaped lounge seat , where the blue charger box is , and 240 v breaker
     
  3. scotjimland

    scotjimland Funster Life Member

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    bad idea.. :thumbdown:

    the 12v permanent supply to the fridge is for the electronics, it is a low power (amps) supply with light cable and small fuse , probably 3 amps.

    If you use that supply to power the fridge's 12v heater, which draws about 7 amps it will likely blow the fuse or overheat the cable.
     
    Last edited: May 13, 2014
  4. nunny666

    nunny666

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    Cheers scottjimland , so I take it the smaller set of brown / blue wires are just for the electronic ignition on the fridge , and the larger pair of brown / blue wires is for the 12 volt supply to fridge ? Thanks in advance , I shall have to find out why no power on the larger pair of red / blue wire feeding the fridge then
     
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  5. nunny666

    nunny666

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    At least I can now use on 240 v and gas , just need to sort pesky 12 v out , if the larger two wires are the 12 v feed
     
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  6. nunny666

    nunny666

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    Stupid phone adding letters , ( cheers scotjimland )
     
  7. nunny666

    nunny666

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    At a guess and it is just a guess their maybe a blown fuse lurking somewhere from alternator wires to the ones that feed fridge ? As it should only come on when engines on
     
  8. scotjimland

    scotjimland Funster Life Member

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    that is correct..

    have you checked the fuse supplying the fridge/split charge relay ..?

    it is generally under the bonnet near to the alternator .. usually in line fuse .. 20A ..
    can be tucked away and maybe taped/tie wrapped to the vehicle wiring loom..

    if it's blown it also means you probably won't be charging the habitation battery .. can you check that ?

    EDIT

    cross posted .. yes again ..

    also.. the split charge relay is usually under the bonnet ..
     
    Last edited: May 13, 2014
  9. nunny666

    nunny666

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    Hi , I will look for it after work tonight thanks , hmm so if the engines running I should be able to hear the blue charge box working just like when on 240 v , ? Thanks for this advice , much appreciated , I would think if theirs been a problem in past before I got the vehicle a fault should blow a fuse before damaging a relay , ( only if right size fuse installed though )
     
  10. TheBig1

    TheBig1 Funster Life Member

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    no the mains charger wont work when the van engine is running but you seem to of got the rest right. the thick pair of wires can be followed back towards the engine battery to find the relay and fuse, which will be close to the battery. the relay will be powered by a thinner wire fed from an ignition live. nothing complicated about it
     
  11. nunny666

    nunny666

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    Yep sorry the big 1 I didn't word right I mean when engine is not on and ime hooked up to 240 v I can here a slight buzz from inboard charger box , so am I right in thinking that when 240 v in in hooked and I turn engine on the on board charger would make same buzz or is it just the alternator that takes over and charges both batteries , new to this mh thing , bit Ike getting of it , thanks again
     
  12. scotjimland

    scotjimland Funster Life Member

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    Highlighted..

    that is correct.. the alternator charges both batteries directly ..

    The onboard charger is only for mains use.
     
  13. nunny666

    nunny666

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    That's great , right now I have something I know I need to be looking for , so already progress made , thanks to you guys pointing me in right direction , my old boss said , it's not what you know but where to find out then remember it , cheers folks , let you know if I find out tonight
     
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  14. scotjimland

    scotjimland Funster Life Member

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    you're most welcome.:Smile:

    I'd put money on it being the fuse feeding the relay that's blown. ..:Wink:
     
  15. JeanLuc

    JeanLuc Funster

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    You refer to the 'blue charger box'; is this a Schaudt EBL99 or 100? I am not sure when Hymer began fitting these - mine from 2003 has one. If you do have one of these, the fridge relay and the charging relay are built into the EBL.
    I think there is an EBL99 instruction manual in the Fun downloads section should you require it.
    Also, if you need technical advice regarding Schaudt equipment, give these guys a call.
    http://www.aandncaravanservices.co.uk/schaudt-elektroblock.php
     
  16. scotjimland

    scotjimland Funster Life Member

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    Not having a Hymer wasn't aware of that ... thanks for info.

    all my previous vans had them under the bonnet..

    hopefully I didn't throw the OP off track.. searching for ever in the wrong place. :Blush:
     
  17. JeanLuc

    JeanLuc Funster

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    You're welcome.
    On the back of the EBL (which many people will not see due to typical location - under seats etc.) there are three big 12V terminals: + Leisure Batt / + Starter Batt / - Common.
    Under the bonnet there are high capacity fuses of course but not the relays.
    On the front of the EBL is a plug-in 'kettle-lead' socket where the 230V ac enters and many people probably think that is the only power input.
     
  18. nunny666

    nunny666

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    [​IMG] I can only find this 5 -amp inline fuse at moment still looking under bonnet tho
     
  19. TheBig1

    TheBig1 Funster Life Member

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    any chance of a better photo showing the wiring to the battery terminals?
     
  20. nunny666

    nunny666

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    My blue charge box is an electromatic la 110
     
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