- Feb 14, 2021
- 4,520
- 10,294
- Funster No
- 79,219
- MH
- Burstner Lyseo 727G
- Exp
- 3 years 30,000 miles UK and Europe.. Campsites and off Grid.
So after a lot of discussion re my melting fuse problem here - https://www.motorhomefun.co.uk/foru...engine-not-charging-leisure-batteries.290430/ I have fitted a new fuse and fuse holder (Seems to be behaving but a longer trip will be needed to check)
I did a little testing this morning and I am convinced that the fridge takes it's 12V power from the the leisure battery when the engine is running.
I am confused as I was led to believe that all motorhomes took the 12v from the starter battery/Alternator when the engine was running. My manual states there is a 20amp fridge fuse on the starter battery - which there is - but it doesn't seem to do anything. There is another 20 amps fuse (the one that melted) by the leisure and this seems to be doing the work. This fuse is not mentioned in the Burstner manual for my model.
I can see that when I turn the fridge on while the engine is running that the leisure voltage drops form 14.8 (charging voltage) to 14.3 so it clearly is drawing power from the leisure. Of course, the leisure is in turn being charged from the alternator (is that correct? or is it charged from the electroblock?) so I assume it's not a problem but it's not the way I understood it is generally done.
I have asked Burstner about this fuse but they are not willing (able?) to tell me.
BTW - it was like this from brand new - no modifications.
So, anyone know that this is the set up on theirs?
I did a little testing this morning and I am convinced that the fridge takes it's 12V power from the the leisure battery when the engine is running.
I am confused as I was led to believe that all motorhomes took the 12v from the starter battery/Alternator when the engine was running. My manual states there is a 20amp fridge fuse on the starter battery - which there is - but it doesn't seem to do anything. There is another 20 amps fuse (the one that melted) by the leisure and this seems to be doing the work. This fuse is not mentioned in the Burstner manual for my model.
I can see that when I turn the fridge on while the engine is running that the leisure voltage drops form 14.8 (charging voltage) to 14.3 so it clearly is drawing power from the leisure. Of course, the leisure is in turn being charged from the alternator (is that correct? or is it charged from the electroblock?) so I assume it's not a problem but it's not the way I understood it is generally done.
I have asked Burstner about this fuse but they are not willing (able?) to tell me.
BTW - it was like this from brand new - no modifications.
So, anyone know that this is the set up on theirs?