Fault with RH Head Light

I have a wacky problem with my right-hand headlight that probably needs the attention of an auto electrician, but here's hoping I can DIY.

I have KZH-106 1997.

The right hand low beam, high beam and parker do not work. I have swapped the fuse with the left hand headlight and the same thing happens. I've checked the globes and connections and they appear ok.

Here's the wacky bit, when I remove the LH (working light) fuse, both headlights work, but only just, that is it is very dull. The parker still does not light up. Why would the LH light work (a little bit) with the fuse removed?

Given the RH does light up a bit, I think I can say it is not the fuse, globe or contact of the high/low beam globe.

Any ideas and suggestions would be great.

Bad earth connection on that side?

Hi Clive, thanks for your reply. Some workmates had suggested that as well. I looked in the battery compartment, expecting to see an earth cable connecting to the body of the van, but there is none there. Do you know where to look for the earth? I haven't been able to find details anywhere else.

Don't know not had to look for mine yet, sorry.

But if you get to the bulb you can run a temp one from there to the body to earth, and then try the lights to see it if is a bad earth.