Hymer electrical

Discussion in 'Motorhome Chat' started by paulnles, Sep 18, 2013.

  1. paulnles

    paulnles Read Only Funster

    Joined:
    Sep 17, 2013
    Messages:
    1
    Likes Received:
    0
    Location:
    northumberland
    Hi there we own a 93 hymer 694 tag axle owned it over 20 months a problem has now occurred with the charging system the charging meter shows when engine is running at tick over the needle is sitting in the middle between red and green and under revs barely moves we have 4 x 110leasure batteries just put new alternator on a week ago but dosnt seemed to have solved anything. While watching tv at night for approx 3hours the starter battery is very sluggish next morning we know using internal lights tv etc is not supposed to affect the starter battery can anybody advice on a solution to our problem many thanks Paul ps we also have to large solar panels on the roof
     
  2. TheBig1

    TheBig1 Funster Life Member

    Joined:
    Nov 27, 2011
    Messages:
    7,224
    Likes Received:
    9,608
    Location:
    Dorset
    sounds like your split charge relay is faulty. this connects the leisure and starter batteries for charging when the engine is running but isolates them when not running. or you have set a switch to draw power from the starter battery. or some numpty wired the tv socket to the engine battery instead of leisure battery
     
  3. Tootles

    Tootles Funster

    Joined:
    Sep 14, 2013
    Messages:
    8,994
    Likes Received:
    30,894
    Location:
    Lancaster
    I seem to think that there is a changeover diode that governs which battery is being charged at what time, and by what action. It's really just an automatic switch, and I know from boat type experience that they can fail.

    I think it works like this: Engine running. Vehicle battery charged until full, then auto switch over to aux battery(s) charge.
    Engine stopped: All 12volt power comes from aux battery(s). If the diode has gone, then its probable that the vehicle starting battery has been allowed to join the aux system.
     
  4. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,447
    Likes Received:
    25,133
    Location:
    Macclesfield
    You might be lacking in electrics terminology ( it's not a diode, could be a "relay" or a nice general term is "module" ) but your sig deserves a thread all of it own, love it.

    >> 'Democracy is two wolves and a lamb voting on what's for lunch'
     
  5. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,447
    Likes Received:
    25,133
    Location:
    Macclesfield
    Way too complicated for a forum.

    You have to break it down and start testing bit by bit starting with the engine battery getting charged, then add leisure, after testing the batts, then solar.
     
  6. Xabia

    Xabia Funster

    Joined:
    Jan 20, 2011
    Messages:
    682
    Likes Received:
    411
    Location:
    Rural Nottinghamshire
  7. Tootles

    Tootles Funster

    Joined:
    Sep 14, 2013
    Messages:
    8,994
    Likes Received:
    30,894
    Location:
    Lancaster
    Sorry, your right, I'm not a 'leccy, it is a relay. We had an old Lucas one on our narrowboat, kept playing up, so I replaced it with a manual three position switch.:Blush:
     
  8. hilldweller

    hilldweller Funster Life Member

    Joined:
    Dec 5, 2008
    Messages:
    26,447
    Likes Received:
    25,133
    Location:
    Macclesfield
    Oh boy, blast from the past. If it was electrical and moved it was Joseph Lucas or Smiths once upon a time.

    Switch is good, KISS, until the day you forget to switch over.

    On here, now, the common solution is "battery master" or cheaper alternatives off ebay. You dump all your charge into leisure and when that is full it bleeds off current to top up the engine battery. That works in conjunction with the usually fitted split charge relay. A nice simple solution.

    A good but sad read: http://en.wikipedia.org/wiki/Lucas_Industries
     
Loading...

Share This Page