the light on my 1989 g reg 90 has a delay of 2 to 5 mins (depends how cold it is) when the head lights when they are swiched on. This only happen when starting from cold or has been stoped for over 30 mins. when the light have come on they stay on with no problems. have tryed the rely in the fuse box, the swiches in the steering collem and the dim dip unit be hind the dash. not sure where to go now. can any one help???