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Have a look on your box is there a switch for 12v .

Delboy

possible the charger is causing interferance,or something else in the 12v line .

if possible disconect battery(or use a second one) and wire box directly to it see if this makes any differance,if it does you then need to find out whats causing the interferance

Quote: Originally posted by JTQU on 18/1/2011

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Another long shot; is a 12 volt fluorescent light on? Had one that made our radio hum badly when on.

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I removed all my flourescents tubes and starters and replaced them with these in the same units,no more humming probs.

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300503088527&ssPageName=STRK:MEWNX:IT

You will need to have a 12V regulator, the 12V from the leisure battery is not a pure 12V signal, put a meter on it and you will see it is anywhere from 14 to 12.6 The same applies to TV's you need to ensure that the equipment is fed from a stable 12V

Hope this helps

can you not do as above and run direct from a seperate 12v battery ie 1 for lights and standard 12v fittings in van 2nd for additional items.i beleive the problem your getting is from the ciggy lighter bit but may be wrong(just ask the wife as i normaly am) but the advantages from having second battery is yould get a lot longer use from both

im in the proces of fitting extra battereys and after reading this deciced for my sittuation all i need is to run my tv/dvd/freeveiw on its own feed with a seperate 240v charger topping it up througout the day.

ive also had a simular problem with buzzing and finaly worked out the signal was far to high/strong and had to fit a UHF Attenuators and solved problem instantly,some boxes do the same themselves so no need for one and others have differant not so good tuners that compensate the signal gain.

theres lots of options but without ripping everything out and starting from scratch ild be looking at the simple solutions

do you have the noise when connected to the battery and the charger is on?

the problem is that your charge is not "smoothed", the AC is being transformed down to 12v ok, but the AC pulses are causing a ripple in the 12v output

with the battery and charger connected at the same time the battery should smooth the pulses out

otherwise you will maybe need a smoother, or switch the charger off