RV Relays - which does what?

Discussion in 'Tech/Mech General' started by Bryan, Dec 6, 2009.

  1. Bryan

    Bryan Read Only Funster

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    Hi all,

    Further to my other thread about the ongoing power issues, I think it would help if I knew what these two relay/solenoids do and how...

    If you look at the picture and recognise the setup please tell me what each of them do and how they are triggered.

    FWIW I reckon one of them may be to do with the battery disconnect switch just inside the habitation door and the other may be to do with the battery boost button on the dashboard for temporarily joining both the starter and leisure batteries together.

    Of course, I reserve the right to be completely wrong. :thumb:
     

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  2. hilldweller

    hilldweller Funster Life Member

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    Not a clue but sure as hell they could generate a whole lot of smoke.
     
  3. scotjimland

    scotjimland Funster Life Member

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    Hi Bryan

    one have it in one.. :thumb:

    The battery disconnect relay ( bottom one I think) is controlled from the unit by the hab door. This automatically trips the relay if the battery voltage drops below 12v ( or thereabouts ) This is to prevent totally flattening the hab batteries... It can also be used to isolate the 12v when putting the coach into storage.

    The other relay is the Emergency start which links engine and hab batteries.. controlled from switch on dash board..

    To positively identify, hold the relays then get an assistant to operate the Bat Disc switch ..

    jim
     
    Last edited: Dec 6, 2009
  4. Bryan

    Bryan Read Only Funster

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    Thanks Jim.

    I think they are both powered from the leisure battery as they only work when the leisure battery has power.

    As they do both work when the leisure battery is powered I don't think they can be a source of the problem I'm having with the parallax converter not powering the buses 12v circuits.

    (My other thread with full details)
     
  5. scotjimland

    scotjimland Funster Life Member

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    Hi Bryan

    distance fault finding is almost impossible, I can only give you some pointers and I'm not great at explaining.. if I were closer I'd pop round and help out..

    The 12v supply to the coach goes through the bat disconnect relay whether on ehu or not ..

    1 Check if relay has a supply and is energised,( the coil feed is the thin wires, ) if not the fault lies either with the battery disconnect switch by the hab door .. or the wiring between the two..

    2. If energised, check the input and output on the thick wires .. if that is ok then it must be bad connection or a fuse blown ..

    come back with your findings..
     
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