Hi
Many thanks for your reply
Yes the light works fine if I depress the switch when it is removed (or short it out).
I did notice one thing though, that the switch make then breaks on the ball over travel. I don't live far from Bearmach, I'm going to pop there tomorrow and see if i can get an OEM switch and test that. The new one I bought looked fine but its an aftermarket one and I don't like the sound of the click inside it.
If all else fails I'll change it to a proximity sensor, I'll just need to do a little research to find a suitable one. I used an endoscope camera earlier and I can see the actuator and think a decent proximity switch would work.
cheers
Paul