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sounds like its not bolted down right. if you got a buzzing thats whats usually causing it as transformers naturally hum (if you go near a sub station they do the same)

try doing what jocko2 has said as this should cure the problem.

 Hi Gary nice to see your input.

Some mains chargers have small transformers inside them. These will cause the noise experienced, As suggested in an earlier post, its out with the soldering iron and ensure there are no dry joints.

Brian

Thanks very much for the advise re- my noisy battery charger. Since my first post i bit the bullet and took the unit apart.  Think I might have mislead everybody as the noisy is actually coming from an internal cooling fan which runs constantly when the unit is charging. not ever so noisy, but very distracting late at night!      since then i've come to realise that the caravan mains electric supply is actually dealing with the 12 volt functions, and thats why it runs for so long - there is no noise from the transformer itself - its all this fan.   after 3 or 4 days when the lesuire battery is fully topped up, the noise shuts off. i assume the battery is a slow trickle charge, and as its 110 amp/hours prob takes ages to charge.    cheers!

 Brilliant, never considered the fan.

You can buy rubber stand offs from Maplins to isolate the fan from the chassis to reduce the noise.

Brian