It is a JVC aftermarket DAB system I put in as a replacement for the basic unit fitted when I bought the MH. Iāve not touched the vehicle wiring to do the install so thereās no iffy wiring to be worried about, it was all plug and play using the industry standard din fittings.
However it is not ignition switched, itās either on from the on/off switch or off and so it will play permanently if so desired.
OK. The wiring
could be the problem here.
Usually you have a +ve Permanent Connection (coloured Yellow typically) that goes to the vehicle
battery and is always powered; There is also a Switched/Accessory +ve Connection (coloured Red typically) that goes to an switched/ignition souce so gets powered with the key.
It is unusual to not have the Red connected to an ignition source if the wiring is standard and not doing so can have the consequences you are seeing on some radios ....
If the radio you took out was very basic, then having the +ve Accessory on Live wouldn't have mattered other then no auto-on on ignition, but what can happen, especially on the more advanced units with DAB and Bluetooth Connectivity, is the radio on/off button does not actually turn the radio fully off! the Bluetooth module is still powered up - and using power - all the time the Red +ve Accessory wire has +12V on it.
It is not all radios, and I don't know if JVCs have this 'feature' or not, but if it does the only way to sort it is to have the +ve Accessory input switched.
This is a common problem with the VW T5s when people fit aftermarket radios as VW do not supply a switched +12V on the vehicle radio loom and the quick 'fix' that is done (even by car radio installers!) is to connect the Red and Yellow wires together. Doesn't break anything on the radio but means there is a drain on the
battery from the radio 24/7. And in the case of the T5, you have to pick up an ignition signal from elsewhere and run a flylead to the radio to fit it properly (or use a Canbus spoofer, but that is a different matter which wouldn't apply to you if you had the standard pair of 8 pin ISO plugs)
To Check, disconnect the red wire (usually has bullet connections on both the Red and Yellow wires for rewiring purposes) overnight and see if ther drain is reduced.
If so - To fix:
1) Check if the red wire always has +12V on it even when radio is on.
2) if so, see if there is an switched supply on the radio loom you can use (it is very unlikely to be red mind. the red and yellow are radio industry standard, not car makers) and connect the red wire to it
3) if there is no switched supply, you could put a switch in-between the red wire connection to the vehicle and it going into the radio, and then use that switch to turn on the radio.
It is in a way the same situation as in your original question .... is an
inverter really off when it is switched off. And a similar answer (but for a different reason).
You also said that "....from the on/off switch or off and so it will play permanently if so desired.". That can be very handy, especially in a camper/motorhome. If you add a switch, you can still do that. If you connect to the ignition you cannot - but you could if, (plugging one of my kits again, sorry) you fit a
Drive/Camping Radio Loom kit which will let you operate both ways depending on how you set the switch.
HTH.
I am sure now you have said that that you have the red and yellow tied together and that is likely causing excessive current drain.
