Help needed - Power gone to radio and 12V when engine off (1 Viewer)

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Zentrumsounds

Free Member
Jan 4, 2023
5
0
Funster No
93,168
MH
Hymer B514SL
Hi folks,

I've lost power to the radio and the cigar lighter in my Fiat based 2008 Hymer 514. I think i blew a fuse when plugging in a power hungry USB device to the 12V adapter. Everything works fine when i switch on the ignition so i suspect the fuse that keeps the radio and 12V powered from the leisure battery is blown. Any ideas which fuse this might be? The MH uses the Elektroblok 101 model.

Help much appreciated thanks!

Jürgen
 
Apr 27, 2016
7,032
8,246
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
If the radio/12V socket supply is coming from the EBL 101, it will probably be on one of the 'Reserve' circuits, so worth checking those fuses. Most of the habitation circuits are on the 'Kreis 1' or 'Kreis 2' circuits. Except the labelled ones of course: Heating, TV and Pump. But I think the radio/socket will probably be wired separately on one of the Spare (Reserve) circuits.
 
OP
OP
Z

Zentrumsounds

Free Member
Jan 4, 2023
5
0
Funster No
93,168
MH
Hymer B514SL
If the radio/12V socket supply is coming from the EBL 101, it will probably be on one of the 'Reserve' circuits, so worth checking those fuses. Most of the habitation circuits are on the 'Kreis 1' or 'Kreis 2' circuits. Except the labelled ones of course: Heating, TV and Pump. But I think the radio/socket will probably be wired separately on one of the Spare (Reserve) circuits.
Hi Autorouter,

Thanks for this. Yes i think this issue is not Fiat side as it seems the Fiat side is working fine because when the ignition is on then all is fine. Do you know if i can hot swap these fuses or do i need to power everything down?

Thanks!

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Apr 27, 2016
7,032
8,246
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
Do you know if i can hot swap these fuses or do i need to power everything down?
I wouldn't bother powering everything off, hot swapping should be OK. You could turn off the 12V power switch on the display panel, that will probably cut the power to most of the circuits, including most of the reserve circuits.
 
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OP
Z

Zentrumsounds

Free Member
Jan 4, 2023
5
0
Funster No
93,168
MH
Hymer B514SL
I wouldn't bother powering everything off, hot swapping should be OK. You could turn off the 12V power switch on the display panel, that will probably cut the power to most of the circuits, including most of the reserve circuits.
Thanks for that tip. Tried both swapping Kreis fuses today but no change to the situation unfortunately.

On another forum people are saying that I'm mad to expect the power to remain available to the 12V outputs and radio with ignition turned off. But this was the behaviour i experienced up until now and asking around on the campsite here in Spain others say their Hymers work the same way.

Am I mad?
 
Apr 6, 2019
3,975
7,858
Eye, Peterborough, UK
Funster No
59,702
MH
RV
Exp
FourWinds Windsport 6.8L V10
It's fairly easy to wire a radio to be live all the time (at the risk of dead battery of course). Some fancy installs have like you say a switch over or a manual switch to say where radio gets power from and when.
 
Feb 19, 2018
5,247
87,902
EAST ANGLIA
Funster No
52,484
MH
Murvi Morello
Exp
Since 1975
Thanks for that tip. Tried both swapping Kreis fuses today but no change to the situation unfortunately.

On another forum people are saying that I'm mad to expect the power to remain available to the 12V outputs and radio with ignition turned off. But this was the behaviour i experienced up until now and asking around on the campsite here in Spain others say their Hymers work the same way.

Am I mad?

On my 2008 Ducato, I was told that the radio was powered by my starter battery, that's why it cuts out after 20min. Is that not correct?

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Apr 27, 2016
7,032
8,246
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
On another forum people are saying that I'm mad to expect the power to remain available to the 12V outputs and radio with ignition turned off. But this was the behaviour i experienced up until now and asking around on the campsite here in Spain others say their Hymers work the same way.

Am I mad?
The radio supply has been covered. For the sockets, in my Hymer there is one socket powered only when the ignition is on. And from the leisure battery, at various points around the MH, there are another 18.
 
OP
OP
Z

Zentrumsounds

Free Member
Jan 4, 2023
5
0
Funster No
93,168
MH
Hymer B514SL
The radio supply has been covered. For the sockets, in my Hymer there is one socket powered only when the ignition is on. And from the leisure battery, at various points around the MH, there are another 18.
Is it not the case that when your Hymer engine is running that the radio and 12v sockets are being run by the alternator (just like the Fridge) and that when you switch off then this moves the power source for these to the leisure battery. I've asked a number of other owners here in person and they seem to have similar behavior. Incidentally i have only one other 12v socket in the Hymer and the rest are standard 220V sockets (i've no inverter).
 
Apr 27, 2016
7,032
8,246
Manchester
Funster No
42,762
MH
A class Hymer
Exp
Since the 80s
Is it not the case that when your Hymer engine is running that the radio and 12v sockets are being run by the alternator (just like the Fridge) and that when you switch off then this moves the power source for these to the leisure battery. I've asked a number of other owners here in person and they seem to have similar behavior. Incidentally i have only one other 12v socket in the Hymer and the rest are standard 220V sockets (i've no inverter).
In a Hymer, as in all non-UK MHs, the question is whether the sockets in the cab area, which are part of the original base vehicle, are still powered when the ignition is switched off. In mine, there's one socket, and it goes off when the ignition is off. It's also possible to wire 12V sockets to work directly from the vehicle battery, so that they stay on when the ignition is off. However I prefer not to, as it's all too easy to flatten the vehicle battery if you park and don't move on for a few days.

I have wired lots of sockets all around the MH, including the cab area, that work directly from the leisure battery.

Another complication on UK MHs, most of them have habitation sockets wired to the leisure battery, which turn off when the engine starts.

Of course while the engine is running, it's the alternator that's powering everything, and also charging the starter and leisure batteries.
 

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