Bongo Fury

I have had a problem with my headlights. I start the engine, turn the headlights on then a couple of seconds the headlights go really dull, so dull you can't see the beam from in the cab. There is a rocker switch under the steering wheel which when turned off, the headlights are fine and bright all the time! Anyone know why there would be a switch that makes the headlights so dull after a few seconds? Asked the garage to check and for ideas when it went in for its MOT and they are stumped because the switch does seem to control anything else . Any ideas?

Only thing I can think of is it is some sort of cloaking device

Quite normal .. the equivalent of our old UK dim / dipped headlight feature ...

With acknowledgements to Bongo Forum posters ..

http://www.bongoforum.co.uk/forum/Blah.pl?m-1301928631/

Strange to put this query on the 'Campsites' forum ..??

Ooops, put it in the wrong place, sorry.

Thanks for the reply

(Edit: Post has now been moved to the Techie forum.)