Single Bulb to Dual Bulb

Matt B. wrote:
> > wrote in message
> ups.com...
> > Andy,
> >
> > One problem you will have when changing from a single H4 type bulb to
> > 2x bulbs is that with the single bulb when driving on dipped beam only
> > one filament in each bulb is on; when you change to main beam the dip
> > beam filament switches off and the main beam one comes on.
> >
> > With seperate bulbs, you need both bulbs to be lit (i.e. the dipped
> > beam and main beam circuits) when main beam is on.
>
> Not necessarily. Some cars are wired like that and some are not.


Maybe not, but VWs are.
>
> > A simple way to work around this is to connect the headlight power
> > supply wire from the rotary light switch directly to the dip beam wire
> > from the column switch (normally this supplies the 'input' side of the
> > column switch) so that the dip beams are constantly on when the
> > headlights are on. The column switch now only controls the main beams.
> > The flash facility will work as normal without any modification needed.
>
> Another solution is found he
> http://www.parts4vws.com/catalog/pro...ber=1H6998531E
>
> It's not so much the headlamp switch, but the jumper that comes with it. If
> you don't already have this switch you might want to look into it anyway
> because it gives you controls for front and rear fogs if you decide to add
> those later.