What has the electrician done?

[acropolis22]

You can see in this photo there are two cables wrapped together with insulating tape. Someone has written "Auto Radio" on the tape. The blue wire is the permanent 12V supply to the audio unit, as detailed in the Electroblock manual. The red wire is taken from terminal 12, which the manual describes as spare.

Does anyone have any idea what has been done here? Seems non standard due to the tape and hand written label.

I want to put a switch in the blue wire to isolate the audio unit when I want to. But I wasn't expecting to see the red wire. How does this affect things?

 

[ivorantony]

Usually you have two feeds to a radio, one is a permanent live feed for the memory and the other is a switched feed for turning it off,

 

[acropolis22]

Usually you have two feeds to a radio, one is a permanent live feed for the memory and the other is a switched feed for turning it off,

Agree. But isn't the switched feed off the starter battery? Switched on and off by the ignition, in other words?

 

[Clivefog]

Often a feed in Moho to listen to head unit while engine off.

 

[acropolis22]

Often a feed in Moho to listen to head unit while engine off.

Yeah. That's the blue wire in the photo.

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[acropolis22]

autorouter ?

 

[autorouter]

Which EBL model is it? The two wires might be a positive and negative supply.

 

[acropolis22]

Which EBL model is it? The two wires might be a positive and negative supply.

It's the 271. Just strange that the red is taken off a terminal marked as spare?

 

[mitzimad]

i would think if running a radio from the leisure battery via the electroblock both feeds need to be from the ebl or you could be negating the split charger by having a feed from each battery to the radio

 

[autorouter]

Usually you have two feeds to a radio, one is a permanent live feed for the memory and the other is a switched feed for turning it off,

The blue wire is the permanent feed to the radio. It comes from Pin7 of the 12-way(Bloc6). In the diagram it is marked 'Continual positive for radio'. There is a fuse labelled 'Autoradio' to supply it, but why it's 15A I don't know, I'd have hoped 2A was more than enough. Inside the EBL it connects directly to the main leisure battery input.

The red wire is presumably the switched feed to the radio. It comes from Pin12 of Bloc6, which I take it is Spare 2. That would be 'Auxiliare2' in French, so I think it goes through that 10A fuse.

I haven't got details of the control panel, but I think there will be a switch on the panel labelled 'Spare' or 'Auxiliare', which will switch off the two circuits Auxiliare1 and Auxiliare2. There's a red wire to Pin9 (Spare1) which will switch off at the same time.

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[acropolis22]

Usually you have two feeds to a radio, one is a permanent live feed for the memory and the other is a switched feed for turning it off,

I'm struggling to understand how the memory is kept alive. The AUX switch on the control panel isolates the AV without losing memory settings. Normally this circuit allows use of the AV without the ignition switched on. The permanent feed, in other words.

EDIT. The settings are lost if the fuse on the "Autoradio" circuit is pulled.

 

[acropolis22]

The blue wire is the permanent feed to the radio. It comes from Pin7 of the 12-way(Bloc6). In the diagram it is marked 'Continual positive for radio'. There is a fuse labelled 'Autoradio' to supply it, but why it's 15A I don't know, I'd have hoped 2A was more than enough. Inside the EBL it connects directly to the main leisure battery input.

The red wire is presumably the switched feed to the radio. It comes from Pin12 of Bloc6, which I take it is Spare 2. That would be 'Auxiliare2' in French, so I think it goes through that 10A fuse.

I haven't got details of the control panel, but I think there will be a switch on the panel labelled 'Spare' or 'Auxiliare', which will switch off the two circuits Auxiliare1 and Auxiliare2. There's a red wire to Pin9 (Spare1) which will switch off at the same time.

Great. Thanks, that's much clearer now. So the red wire goes through the ignition switch, and the blue supplies permanent feed unless AUX is switched off at the control panel?

 

[autorouter]

No, it's the other way round. The blue wire (memory) goes straight to the EBL leisure battery main feed, via the 'Autoradio' fuse.

The red wire (power) may have originally come from the ignition, I don't know, but now it comes from the leisure battery, through the 'Auxiliare2' fuse. The AUX switch on the control panel will switch it off. The AUX switch also switches whatever is connected to the 'Auxiliare1' fuse.

In theory you could wire in a relay that switches the red wire to the starter battery when the engine is running. That's exactly what I did. Then I realised that the split charge relay charges the leisure battery from the starter battery/alternator when the engine is running anyway, so it was a bit pointless.

 

[acropolis22]

No, it's the other way round. The blue wire (memory) goes straight to the EBL leisure battery main feed, via the 'Autoradio' fuse.

The red wire (power) may have originally come from the ignition, I don't know, but now it comes from the leisure battery, through the 'Auxiliare2' fuse. The AUX switch on the control panel will switch it off. The AUX switch also switches whatever is connected to the 'Auxiliare1' fuse.

In theory you could wire in a relay that switches the red wire to the starter battery when the engine is running. That's exactly what I did. Then I realised that the split charge relay charges the leisure battery from the starter battery/alternator when the engine is running anyway, so it was a bit pointless.

Ok, but I'm a bit confused now. If I switch off the AUX circuit, the AV no longer can be switched on when parked up, but it can still be activated by switching on the ignition.