Just traded in my very basic 1991 Troll for a 2008 Troll 540GT and when plugging into mains there is a humming noise in the battery area which is annoying at night. I assume its the battery charger and wondered if this can be switched off or a switch installed.

Have you checked to make sure the fitments are tight? and not resonating? Just a thought, I have a cover on my fuzes that is taped specifically to stop this type of noise

It probably comes from 'loose windings on the mains transformer' in the charging system. Not a problem, but annoying I agree. My system makes this noise when charging a battery if it is a bit low on charge - however since I keep the system on most of the time, maintaining full charge when laid-up, I no longer get the 'hum' !
You should, of course, follow Agger's advice and check security of all the fitments :)

Hope it goes away :)

I'm assuming that whilst the battery is fully charged it will continue to 'trickle - charge' rather than shut down - thus only a very small current is flowing, but when a full charge rate is required, heavier current flow causes the 'transformer windings' to chatter, maybe because they're getting hotter as more current flows ?

This is only surmise from my point of view ! !

It is possible that the battery never reaches 'full' so the heavier current continues all the time. A battery charge check would answer this. I suppose disconnecting the battery, stopping the current flow, would indicate if the noise is caused by the charging current flow ?

I have to say that these are only my own ideas - don't take it as fact !!!!!

Any more ideas any one !

Humming is coming from charger as noise changes when placing my hand firmly on top. Charger is a SCHAUDT LA1210 and wiring also goes to a little box labelled JQX - 10FH. The charger has removable + and - red and blue leads and the little box has a yellow switch on the top. Tempted to try pulling / switching but hope to receive more info beforehand. I will try and download pics !

Hi Randa, yes I will try some insulation on top first and allow ventilation.

Hi Randa, After removing the cover and unscrewing unit from floor there is hardly any noise. I will try using strips of door rubber draught excluder to isolate from floor and consider leaving cover off. Ta.

You could always use the round door stops? They have a screw fitting and could be cut to size?

Great tips. Many thanks. Another thought - instead of screws, using the strong thick double sided tape for fixing number plates as sold in Halfords.