Taxi 516 Posted May 12, 2021 Share Posted May 12, 2021 The 20amp leisure battery fuse internally intermittently gets very warm and melts the casing before blowing. It only appears to be doing it when the engine is running and being turned off. I am leaning to a faulty split charge relay does anyone have any other suggestions. ? Dealer can't seem to be able to repair under warranty so maybe a auto electrician if no advise here. Many thanks and let's hope someone out there can help Andy Link to comment Share on other sites More sharing options...
_Chris Posted May 12, 2021 Share Posted May 12, 2021 I would check that the leisure battery isn't knackered and drawing too much current. Link to comment Share on other sites More sharing options...
weldted Posted May 12, 2021 Share Posted May 12, 2021 Check the battery voltage by pulling the fuse let the battery rest for at least an hour (free surface voltage) check the voltage, leave overnight disconnected and check again. If it has dropped by more than 0.5 volt it may be suspect. If not with it all connected run the engine and check the voltage both at the engine battery and the hab one around 14.4. They should both similar the hab one may be a bit less because of voltage drop in the wiring. Other things to check are the terminals clean and tight on both batteries, is the earth strap from the engine battery clean and tight where it fixes to the chassis. If you can get an ammeter that will take say 30 amps, put this in line with your battery to the supply lead and check what current is flowing. Link to comment Share on other sites More sharing options...
Taxi 516 Posted May 12, 2021 Author Share Posted May 12, 2021 Hi Suspected the battery and replaced with a new one but still does it all internal connection appear ok. Andy Link to comment Share on other sites More sharing options...
buddy Posted May 12, 2021 Share Posted May 12, 2021 Are you sure 25 amp fuse is correct ? My van has a 40 amp inline fuse (which is correct according to its handbook) on the leisure battery and another 40 amp one on the cab battery. Link to comment Share on other sites More sharing options...
Keithl Posted May 12, 2021 Share Posted May 12, 2021 Andy, What year is your Swift and what make/model of base vehicle is built on? ie Fiat Ducato X250. Do you have wiring diagrams for the habitation side electrics and if so what fuse is shown as per Buddy's post above? Keith. Link to comment Share on other sites More sharing options...
_Chris Posted May 12, 2021 Share Posted May 12, 2021 I would be very wary of uprating the fuse until you have checked the specification as you could very easily make matters worse. My main habitation fuse is 30A rated and has a very simple 40A changeover relay. If yours is similar then they are as cheap as chips and it may be worthwhile trying a new one. What is going to draw 20A+ when the engine is running with a new leisure battery & presumably with the fridge switched off (?) (?) Link to comment Share on other sites More sharing options...
Taxi 516 Posted May 12, 2021 Author Share Posted May 12, 2021 Evening Keith It's a 2009 35 100m-jet mwb Unfortunately there are no diagrams for internal only engine and original loom. Going to look for split relay on Saturday and try Google for testing. Andy Link to comment Share on other sites More sharing options...
Robinhood Posted May 12, 2021 Share Posted May 12, 2021 The 2007 and 2008 Swift Handbooks both contain the phrase (viz a viz the cab battery).... Your motorhome has been fitted with an inline fuse between the battery terminal and strip connector. It is recommended that the fuse rating fitted in this location does not exceed 40 amps It might be worth substituting a higher value fuse (not exceeding 40 amps) to check if it overcomes any issues. Link to comment Share on other sites More sharing options...
buddy Posted May 12, 2021 Share Posted May 12, 2021 The wiring diagrams for Swift motorhomes from around the 2008 - 2010 period all show a 40 amp fuse when the Sargent electrical Ne184 or PSU460 is fitted, but I believe that at this time Swift also used another system (Nordelettronica) which may have a different set up regarding fuse sizes. When the correct fuse size is confirmed it would be worth replacing the fuse holder anyway, as suggested, as it may have damage due to the overheating that has taken place . Link to comment Share on other sites More sharing options...
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