full beams become much brighter when switch is held back!

[Donuts]

  Strange one this...
Dipped beams work fine - that is, they are very bright. However, when I pull the switch to select full beams, they become bright for a split second and then fade some. All four lights come on and the light produced is enough, but not great. But if I then pull the switch back (pulling it against the spring) and hold it in that position, the lights become much brighter!!
What's going on?
I am considering buying the upgraded wiring loom, but maybe there is a problem with the switch?

Any tips appreciated. Thanks.

[Diamond Hell]

Sounds like the switch is tired to me, although you'll do well to check the earthing points around the vehicle.

The relay kits use the original live feed to the lights as a signal line to switch a full 12V direct from the battery through to the lights.

[Donuts]

Thanks. I'll have a look at the earth points. Would taking the switch off and cleaning it make any difference?

[Horney]

All my dubs have done this, no idea why!

Nick

[gusto]

mine dose the same and i found out that when u swich to main beam it lowers the other lights but if u hold the swich back it lets all lights have full power if you no what i mean great to blind the tw@s with them bright lights on dark roads lol

[Dec]

Its just that when you put it on full beam, it uses just the full beam part of the bulb but holding it back uses both the dipped beam and full beam parts of the bulb. If you notice, there is more light just in front of you when you do this

My dads friends motorbike used to blow a fuse using this method

[gusto]

just what i was trying to say lol   

[Jay]

I hold the stalk there when going along the B roads when it's dark 
It's like friggen day time   

[Mr Blue]

I hold the stalk there when going along the B roads when it's dark 
It's like friggen day time   

Thats exactly what i do.

Thought this was normal? didnt know it was a fault. yaaay another thing to fix

[Khare]

mine does it too, when you turn your spots on the dipped cme on and give a dark patch directly infront of you. I want to know how i can change it so when spots come on the main beam stays on too.