Dim dip resistor, fitted to 2cv6 and AX from April 1987

The UK Road Vehicle Lighting Regulations required vehicles first used on or after 1 April 1987 to be fitted with a (non-essential) dim-dip device or running lamps unless they fully comply with the 76/756 EEC lighting installation Directive. Dim-dip devices must provide an intensity of between 10 and 20 per cent of the intensity of the normal dipped beam. Running lamps must provide an intensity of not less than 200 candela directly in front of the lamps and parallel to the longitudinal axis of the vehicle, and not more than 800 candela in any direction.