H4 headlight bulb connections

[vibrac]

I have to connect to a 12v H4 headlamp bulb it has 3 pins any 2 produce differing light light from a battery (dip or head or perhaps both?) but I have an idea there is a right way to connect earth dip and head leads and I do not have any pre formed 3 pin plug that could give me a clue so I just want to connect to the blades directly for the moment while testing.
this is the configuration |_| which is earth? common sense says its the middle one -but when did common sense have any sway in electrics??

 

[Comet Rider]

Hi Tim,

Main Beam Dip Beam Earth as per your layout

Neil

 

[Pete Appleton]

But your bulb is upside-down

 

[vibrac]

Dont start pete
you work with what you have and I have a 1867 typewriter keyboard layout
I know I am not the fastest on electrics but I can turn it through 180
(you know I just knew the boffins would'nt make the middle tag earth, far to easy too much like a 3 pin plug perish the thought they might make it common sense)

 

[Pete Appleton]

Sorry. Pet hate is those people who wedge their bulb in the wrong way up then drive around dazzling everyone.

 

[nkt267]

Pet hate is those people who wedge their bulb in the wrong way up then drive around dazzling everyone

A lot in favour of the standard miller lamp then,,John

 

[roy the mechanic]

As I remember- look at the back of the bulb, right side = earth, top=main, left side -dip.