Installing H4 headlights - how to wire main beam?

[McTavish]

Hi,

I'm going to install H4 headlamps into the wing pods of my Griffith. What would be the most appropriate method to power/wire the additional main beam filaments in the H4 bulbs?

My current thought is to use the existing H1 low beam connection to power the H4 low beam and take a feed direct from the main beam driving lamps in the nose, effectively providing a switched power supply to the new H4 main beam bulb filaments - does this sound sensible?

Second question is how best to improve the brightness of both pairs of lamps?

My current thought is to fit a pair of relays - one for each pair of lamps. Power the relays via a starter motor feed and use the current headlamps power supplies to switch on/off each relay and install new headlamp power supplies from each relay - one for pod located lamps and one for nose located lamps - sound reasonable?

Many thanks,

Alasdair

Edited by McTavish on Thursday 25th March 19:02

[Ant.]

The dipped beam supply in the pods stays live when you go to high beam.
So you can simply use a relay to switch that supply between the two H4 filaments.
The relay can be switched by the main beam supply in the mouth.

[McTavish]

Thanks Ant, If I continue to use the existing low beam power supply then I'll wire the the new H4 main beam the way you suggest.

However, to increase the voltage and hence brightness, I'd assume my suggestion for a new power supply from the starter would be feasible and use the exisiting lamp supplies as switches for the new relays?

[Ant.]

McTavish said:

Thanks Ant, If I continue to use the existing low beam power supply then I'll wire the the new H4 main beam the way you suggest.

However, to increase the voltage and hence brightness, I'd assume my suggestion for a new power supply from the starter would be feasible and use the exisiting lamp supplies as switches for the new relays?

Yes , that would also work.

[McTavish]

Thanks Ant, much appreciated