Right having a few issues with the rear lights on my S2 cab turbo.

1. Reverse lights dont work on either side (Have checked bulbs)
2 When idicating right the fog light switch (little orange light) in the car will also tic in time with the indicator.
3. When running at night with headlights when indicating right if i press the brake pedal the idicator will stop flashing but as soon as i release brake pedal the indicator comes back on.

I have checked all bulbs and cleaned all earth points i can see. I have been told that the actual connectors on the light clusters can sometimes go. If not what else could be causing this.

 

it is definately an earth problem usually on the plug that plugs onto the cluster, you can buy new plugs or just clean them

 

As said classic disco light problem, it's normally the pins that corode, despite being galvanised!!
New bulb panels are around £6 per side, I would add a decent size earth wire direct to the earth track on the lamp panel to ensure decent lights in future.
tabetha