Got to the bottom of my battery drain problem,an open circuit in the ignition switch,thought it was just a simple adjustment but there's more to it than I first thought,so a new switch is required.
On a brighter note the engine's running cooler now thanks to the correct fan belt. (no slippage)

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.