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What a load of crap if you disconnect the earth lead you have broken the circuit .

Then you will moost definatley lose all radio codes etc dont know what all the fuss is about Mick silverwood gave the best answer a simple old fashioned way to jumpstart or charge .

Get a bit of life into the battery and change if neccessary, you can buy a module to fit into your cig lighter that will keep enough poweer to retain code memories etc .

Delboy

Well,I don't think Delboy's respones was that "nicely" put..

(..no matter how correct it was...  )

TrevChrizy..it may be worth just checking to see if your charger is supposed to sort both batteries out and that something hasn't just failed..maybe...

I know that our onboard charger both batteries but the bulk of charge goes to the leisure first.

(..although on our previous Compass it only charged the leisure battery..)

Dont know how old your van is , but I had to check and recharge my batterys cab and leisure a couple of weeks ago on my swift' ducato base... I just made sure everything radio/display panel was switched "off"  and dissconected and removed the two batterys checked the fluid levels and then charged them out of van.(cause on power supply where stored).

Reinstalled a day or two later no codes lost or any faults,  "silly question" but have you not got the radio code written down in the handbook somwhere ??   

Either way if you do manage a jump start, I'd still top the levels up and give both batterys a good charge "off " the vehicle to ensure you get them back to full capacity.

On my 2002 Bessacarr E415 if I was hooked up to the mains the on board battery would charge if the panel switch was on Cab position, if I forgot and left it switched to interior battery the alarm would flastten the cab battery within a few weeks.

Just changed to a new Elddis and the on board charger only charges the interior battery (common on newer vans). If you have a mains hookup you can buy charger/conditioners that connect via the cigarette lighter socket to keep everything topped up.

http://www.amazon.co.uk/Ctek-CTE-XS3600-Battery-Charger-Function/dp/B000RHWCNY

cheers

Dave