Dim Headlights

[PatriciaH]

What causes this ? battery ok ,

[markja]

possibly a bad earth. run a wire from the negative/earth on the battery to the negative/earth on each bulb. also using a spare bulb plug it into the socket and see if it is bright, if yes then you may have duff bulbs fitted.

[ELVIS68]

Daft as it may seem but cleaning the lens might help

[PatriciaH]

Thankyou x

[Brooksy]

Er, you haven`t got a car with those dim-dip headlamps have you? What year & model is it?

[TonyBeeeee]

Following on from markja and brooksy...

Is this apparent only on dipped beam or main as well?

If its on both suspect a bad earth, but it would be unlikely both sides would develop a poor earth connection at the same time: if its only on dipped then suspect the dim dip fuse/relay/resistor. I would go for the second scenario first (I replied in the same order as markja and brooksy).