Thread: Adjusting Head Lights

Hello All,

I looked online and also at the instructions for my current VY and compared it against the instructions from my old VN Gregory"s manual.

Both mention that the car must be parked 7.6 metres from a wall and the headlights should be aimed so that the centre of the light beam is 105 lower than the centre point head light lens were aimed way down and they light up far too close to the car for night driving on low beam at 100 KPH.

I need to be able to calculate where the centre of the headlight beam should be before I can drop it down 105 mm.

It is not a case of just a wee bit of minor adjustment my headlights are myopic big time! There current "centre line" position is not an accurate reference point to do some fine adjustment off.

Could I measure the distance between the ground and the centre of the headlights to give the missing measurement of the physical centre of the headlight? Represented by the green horizontal line of the photograph of a car in the second photograph.

Where (X) in the diagram it is the Ground Level of the car parked on a concrete slab and the measurement (?). This is the headlight adjustment outline in the first diagram

Do I measure this height onto the wall that is at the same height as the concrete slab and then adjust the headlights until they reach the top horizontal line? It would equal the centred of the headlight to the centre of the headlight beam 7.6 metres away from the car.
Then I just drop the centre line 105 mm below the previously marked.

I am getting new tyres with a different profile fitted tomorrow morning so I will go play in the dark tomorrow night.

Kind Regards
Lionel

Originally Posted by Blknight.aus

the reference center line is measured from the height of the filament of the bulb

I recommend that you do this alignment with max weight in the vehicle, and if you regularly tow a vehicle with the trailer on the back set up for max design ball weight.

Agree absolutely. Back in the day we had an apparatus that would measure the focal height of the lamp, and then measure the required adjustment. It was a bit Heath Robinson, but it worked. You don't see them now, probably because they don't have a computer in them, but check out how badly aligned the headlights on cars fresh from the panel shop.