I spent some time today 'troubleshooting'.
Turns out the switch isn't as bad as I first thought,it turns out I had a couple of dodgy grounds due to some thick powdercoat.

I'm still not entirely happy with the ROC switch though.....

I'm still considering the Hersee switch.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.