battery fuses

Discussion in 'Motorhome Chat' started by Goldenoldies, Feb 4, 2013.

  1. Goldenoldies

    Goldenoldies Funster

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    Our motorhome is on the Fiat Ducato 3.0.
    Today it would not start. On the control panel it has always shown vehicle battery 12.1v good, (RAC said this should be no lower than 12.4 to start an engine) leisure battery13.7 good. How ever I tried to start but no go,tried to jump start no go.
    So I called the breakdown service (RAC). After doing all the things I had already done, he gave it an extra boost and it started.After letting it tick over for about 30 mins tried to start with out boost no luck,back on boost started. then checking the battery charge showed before the fuse charging 14v after fuse no charge. He replaced the faulty one with a 250amp fuse now all seems good. The problem is the one he took out has CAL5 32v on it and he is not sure if this is too strong. I have check the handbook been searching online but cannot find any information or where to get replacements from. Im hoping someone has some knowledge of this system.
    For the record Leisure battery showing 13.7v Vehicle battery showing 12.7v good.
     
  2. Southampton

    Southampton Funster Life Member

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    My previous MH was a Fiat 3.0 ltr Lunar Roadstar 800 (57 plate) and had the same problem. My CAL 5 fuse blew and it would not start showing the same battery voltages you have. The mobile mechanic that visited ordered me a new fuse from the nearest Fiat van dealers and I had to go pick it up. When I picked it up the Fiat garage said something about there was an upgrade between CAL 4 and CAL 5 but I cannot remember which way round it was. Try your nearest Fiat van and truck garage. Not much help but maybe steer you in the right direction.
     
  3. pappajohn

    pappajohn Funster Life Member

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  4. Southampton

    Southampton Funster Life Member

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    Yes that's the one, a wheat grey colour that I got from the Fiat dealer, the same colour as the one I replaced.
     
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  5. pappajohn

    pappajohn Funster Life Member

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    from what i see the 250amp fuse will be pink and is a MEGA fuse.....not a CAL type, though they are identical in size and shape except the fixing blade thickness.
    the mega is 1mm thick and the CAL is 1.8mm.
     
  6. Curtisden

    Curtisden Read Only Funster

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    Mega fuse

    Same problem last year with a new boxer.
    Dealer £25 E Bay £3?
    Peter
     
  7. Goldenoldies

    Goldenoldies Funster

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    The one the RAC fitted is a lot thinner and black said its used in connection with the boost charger or somthing.
     
  8. MikeD

    MikeD Funster

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  9. pappajohn

    pappajohn Funster Life Member

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    I would change it for the correct one as soon as possible as it appears to be an unknown/non-descript fuse.
     
  10. Curtisden

    Curtisden Read Only Funster

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    Mega Fuse

    When we broke down with this problem. Took the Mayday Green Flag type a hour to find the problem and he then simply connected the cable direct to the battery bypassing the fuse.
    Its the amperage rating that matters surly on a fuse and it seems we may have tried to start the camper in gear?
    Peter
     
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