Some Blackening on fridge connection to EBL - BL4

Discussion in 'Fridges & Ovens' started by Deanobeano, Aug 23, 2018.

  1. Deanobeano

    Deanobeano Funster

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    We are off on a trip next week so I was doing a few inspections etc on the hab side of our Frankia (2009)
    I noticed that the wires coming off the Elektroblock on BL4 looked a bit corroded and on one of them, the insulation had blackened a little.

    A placed the fridge on 12V and left it running for half an hour or so. The wires were slightly warm to touch.

    I unplugged the connector and the connections inside the EBL, that the connector plugs into appeared clean.

    Should I look to clean and remake the spade connections on the connector?

    I only use 12V when driving, relying on gas for fridge when parked up as our 2x100W solar will only cope with the fridge if in full sun.

    The schematic states that BL4 is the starter battery connection - is this correct? does it mean that running the fridge on 12V doesn't use the leisure batteries?

    On my display panel, running the fridge indicates a c10 Amp draw that the solar input them tries to make up for (ie solar today indicates 6 Amps input. )

    I thought my regulator (Votronic duo) hooked into the EBL only sends 2 Amp or similar to the starter battery
     
  2. Richard and Ann

    Richard and Ann Funster

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    If the connectors are warm it means there is a small voltage drop across them and they are themselves using power :eek:.

    They need to be tight, I would cut them off, remake and make sure they plug on tight.
     
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  3. autorouter

    autorouter Funster

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    The connection from fridge heater element to the starter battery is dual-purpose.

    When engine is running, the alternator charges the starter battery, and also powers the fridge 12 volt heating element to run the fridge while driving.

    When the engine is stopped, the wire is disconnected from the fridge, and is used by the mains charger (and probably the solar controller) to charge the starter battery.

    The switching is done by a couple of relays, switched by the D+ signal from the alternator.

    Some motorhomes, including my Hymer (German), have another relay that connects the fridge 12V element to the leisure batteries when the engine is stopped, if '12 volt' energy source is selected. British vans for some unknown reason do not have this facility.
     
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  4. autorouter

    autorouter Funster

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    The fridge current is about 15 amps, and most spade connectors are rated at 16 amps, so you are very near the limit. They need to be clean and tight, so yes I would check them and clean and remake them if necessary.
     
  5. JeanLuc

    JeanLuc Funster

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    Not an uncommon problem with EBLs. I have had the same issue with an EBL 99 which uses mate-n-lok pin connectors. If there is any slack or wear in the connection it will tend to arc and burn out the connector. Ideally, get a new connector and remake the connection, cutting back the cable to remove the blackened section.
     
  6. Reallyretired

    Reallyretired Funster

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    My Rapido (French) doesn't have this facility, neither did my last one Dethleffs (German) so I think you must be one of a lucky few. I would certainly find it useful as often in full sun my 400w solar is producing up to about 20A which I can't use once the batteries are fully charged.
     

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